Limits of the Expert Report: Reviewability, Judicial Discretion and Effective Objection

An expert report does not bind the judge; however, the judge cannot replace review of the report by resolving, on personal conviction, a question that requires special or technical knowledge. A report can serve as the basis of a judgment only if it stays within the limits of the expert's task, rests on traceable grounds, explains its method and addresses the material objections raised against it. In civil proceedings, the period for objecting to a report is two weeks from service. If the conditions are met, a single additional period of at most two weeks may be granted, provided it is requested within that period. 1–3

The outcome of a dispute sometimes rests on a single technical assumption: the floor area of a building, the length of employment, the date of a record, the classification of an item in a financial statement, or the period over which a loss is calculated. When that assumption is not openly discussed, the basis of the legal decision also becomes invisible. The problem is not only that a report may turn out to be wrong; it is that the route by which the supposedly correct result was reached cannot be shown.

For this reason, the real safeguard in expert evidence lies in the reviewability of the examination before it lies in the expert's title. The court should draw on technical knowledge; the parties should be able to discuss the grounds of that knowledge; and the court should take responsibility for the final legal assessment through its reasoning. When one of these three functions is missing, the existence of a report alone does not show that a fair examination took place.

This article primarily addresses civil proceedings under the Code of Civil Procedure No. 6100 (HMK). Differences in criminal and administrative proceedings are explained separately. The practical examples given are illustrative; they are not accounts of a particular file or of the firm's experience.

Where does the expert's task begin and end?

Resolving a technical question versus determining the legal outcome

Article 266 of the HMK limits recourse to a court-appointed expert (bilirkişi) to matters whose resolution requires special or technical knowledge. An expert cannot be consulted on matters that can be resolved by general knowledge, experience or the legal knowledge required by the judicial profession. Article 279/4 of the HMK and Article 3 of the Expert Witness Law No. 6754 (Bilirkişilik Kanunu) also prohibit the expert from making legal characterisations and assessments. For a person with legal training to be appointed, he or she must document a separate area of expertise outside the field of law. 1, 3

This limit cannot be drawn by checking whether a statutory article appears in the report. A calculation table can also conceal a legal choice. If the expert has decided for himself which period of work to exclude, which payment extinguished the debt, or which contract clause is invalid, he has built a legal assumption into the numerical result.

For example, a technical deficiency in the load-bearing system of a building is a matter for engineering examination. Which person that deficiency makes liable, on what legal ground and to what extent, requires an assessment by the court. The expert may explain the deviations from the technical standard and their effect on how the event came about. By contrast, it is not sufficient to reduce all the conditions of legal liability to a single fault percentage.

Review should begin at the appointment decision

Under Article 273 of the HMK, the scope of the examination, the questions to be answered and the time for the report must be determined. Sending a file merely "for examination and a report" can leave it to the expert to define the technical question. This results in an unnecessary examination, and the decisive issue may also remain unanswered.

A sound appointment separates the disputed fact, the available data and the expertise needed. If the court has not yet decided on a disputed legal assumption, the expert can be asked to calculate on clearly stated alternatives. Such a report does not decide the case; it makes the technical consequences of the court's different assumptions visible.

What is an expert report that is open to review?

Reviewability cannot be reduced to the length of the report or to a long list of documents. The reader must be able to follow the link between the conclusion and its basis. Article 279 of the HMK requires the report to contain the material facts, the reasoning and the conclusion; Article 55 of the Expert Witness Regulation (Bilirkişilik Yönetmeliği) requires the method of examination, the scientific and technical bases and a reasoned conclusion to be explained. 1, 4

Testing the report's reasoning with five questions

The questions below are not a test separately named in the law. They are a framework that helps apply the statutory duties of reasoning and review to a concrete file:

• What data was used? Are the date, source and relevant part of each document specified; does the examination cover all the necessary records?

• Which method was chosen? Is the measurement, comparison or calculation method explained; is its suitability for the particular dispute shown?

• How did the report move from data to conclusion? Can the intermediate steps, assumptions, coefficients and excluded items be traced?

• How were uncertainties handled? How do missing records, measurement limits, different data or alternative explanations affect the conclusion?

• Could the objection change the result? Is the alleged error a minor clerical issue, or does it affect the basis of the calculation or the technical assessment?

In a valuation report, listing comparable properties is only the beginning. The report must also explain why the comparables are comparable, what adjustments were made for differences and why the valuation date was chosen. Likewise, giving a final total in a calculation report does not open the calculation to review.

Reviewability does not always mean that everyone would reach the same scientific result. In some fields of expertise, more than one method may be defensible. What is expected is an explanation of why the method was chosen, what its limits are and how it affects the result. This is where a scientific disagreement is distinguished from an unreasoned opinion.

Software output is not a substitute for reasoning in digital examinations

A score, match or classification produced by a program is merely tool output. The result becomes open to discussion to the extent that it can be explained which version of the file was examined, how the data was processed, which settings of the tool affected the result and what its known limitations are.

The basic legal principles in this field are also unchanged: the expert must perform the task personally, comply with the duty of confidentiality and bear responsibility for the opinion given. Using artificial intelligence or other software does not transfer these obligations to the tool. Rather than imposing the same technical checklist on every file as if there were a specific statutory requirement, the effect of the method used on the concrete result should be examined. 3

Can an expert examination change the burden of proof or make up for missing evidence?

In civil cases governed by the principle that the parties bring the facts and evidence, the expert cannot generate on his own the facts that the parties must assert and prove. Read together, Articles 25, 190 and 194 of the HMK show that technical examination and the assertion and proof of facts are different functions. Turning to an expert does not shift the burden of proof to the other party. 1

The important distinction is this: the absence of a record that should have been examined is not a technical finding that the event the record could have proved did not occur. A missing record may create a problem of proof, but the legal consequence of that problem is determined by the court. The expert must state the gap and its effect on the opinion clearly.

Article 275 of the HMK provides that the need for the necessary records and documents to be obtained must be notified to the court. A party, too, must go beyond saying "the report is incomplete" and explain which document affects which finding. Moreover, an objection to the report does not by itself restart the periods for submitting evidence. Evidence shown later is assessed separately under Article 145 of the HMK and other applicable procedural provisions.

The other party's strongest defense may be that the requested document is irrelevant to the dispute or incapable of changing the result. An effective objection also takes this defense into account: it shows not only that the document exists, but which assumption of the report it could affect and why.

Is a report containing legal interpretation unusable as a whole?

The prohibition on legal assessment by the expert is clear. Even so, not every legal statement in a report can be tied to a single uniform outcome that automatically disregards all technical findings. What must be examined is whether the assessment that exceeds the limits of the task can be separated from the technical findings.

For example, the expert may have explained the measurements and the calculation and then written that the action should be upheld. The court cannot put this legal conclusion in place of its own assessment. Assessing the measurements, whose reliability is reviewed separately, is a different matter. By contrast, if the entire calculation method has been changed on the basis that the contract is invalid, deleting only the concluding sentence may not cure the problem. How the legal assumption has been built into the calculation must be investigated.

Nor is the debate in legal scholarship one-voiced. Starting from the non-binding nature of the report, Murat Atalı criticizes treating the inclusion of a legal assessment as a transfer of judicial power in every case, and discusses the need for legal assistance from the standpoint of what the law ought to be. This view does not remove the express prohibition in force. It does, however, show why the automatic conclusion that "there is a legal statement, therefore judicial power has necessarily been delegated" should itself be questioned. [11, p. 3277–3281]

The approach advocated here is this: the breach of the task must be identified; the effect of the breach on the reasoning, the calculation and the judgment must then be shown. The strength of an objection depends as much on demonstrating this effect as on repeating the prohibition.

Within what limits may the judge's free discretion be exercised?

Article 282 of the HMK provides that the expert's opinion is to be freely assessed together with the other evidence. The judge need not adopt the report as it stands. However, the reasons for accepting or rejecting it must rest on the material data in the file, the applicable law and the nature of the technical examination. 1

An addition error in a report is not the same as a methodological error that requires expertise. A judge can notice an obvious calculation mistake. By contrast, if the technical examination needed to choose between different medical, engineering or accounting explanations is lacking, this gap cannot be filled with personal knowledge.

The decision of the Civil General Assembly of the Court of Cassation (Yargıtay Hukuk Genel Kurulu) dated 05.07.2023, E. 2023/487, K. 2023/708 discusses this limit in a composition (konkordato) dispute. The decision distinguishes between reviewing a report for expertise, clarity and reasoning, and a judge putting himself in the expert's place. In the assessments concerning over-indebtedness and the feasibility of the project, it addresses reaching a conclusion without clarifying the points that required technical examination and the differences between the reports. [9, §§ 25–30, 35–41]

The principle that can be drawn from the decision is not that every report must be followed or that a new panel must be appointed on every objection. If the need for technical support continues, rejecting the report does not remove that need. The court must determine which deficiency is to be cured and by what method.

How should the court choose between conflicting reports?

Accuracy does not increase automatically as the number of reports grows. It cannot be said that the most recent report prevails over earlier ones, a three-member panel over a single expert, or an institutional report over another expert opinion, absolutely and merely because of those features. Subject to special statutory provisions, what is decisive is expertise, data, method and reasoning.

The first question is whether the reports are actually comparing the same thing. A change in results between two reports prepared on a value at a different date, a different scope of damage or a different set of records does not always show a real conflict. By contrast, results that exclude each other on the same data and the same question may constitute a material disagreement that must be explained.

The conflict should be broken down into levels: is the document used different; is the factual assumption different; is the method different; has the same method been applied wrongly; or has the legal assumption changed? A request for a new examination should be made concrete through this distinction.

A change in the result in a supplementary report is also not, by itself, proof of unreliability. A new document or a justified methodological criticism may make the change necessary. However, the expert must explain why he departed from his earlier opinion. A figure that changes without a new basis, or the same result repeated despite the objections, leaves the review problem in place.

How are expertise and impartiality reviewed?

An expert's inclusion on the list does not mean that he or she is competent on every technical matter. The link between the subject of the examination and the expert's main and sub-fields of expertise must be established. In a multidisciplinary dispute, whether all the necessary expertise is covered is assessed separately. Article 275 of the HMK provides that the expert must report a lack of expertise or the need to cooperate with another expert. 1

An objection to impartiality, however, cannot be based on the report being unfavorable. The relationship with a party, a link of interest or specific facts casting doubt on impartiality must be explained and, if possible, documented. Under Article 272 of the HMK, the period for grounds of challenge is at most one week from learning of them. The grounds of disqualification and the court's authority in relation to them are regulated separately. This period must not be confused with the two-week period for objecting to a report. 1

Requesting a supplementary report from an expert does not by itself create an impartiality problem; it is a route expressly provided by the law. By contrast, the nature of a relationship such as having advised one of the parties is examined separately. Criticism of a report and a challenge to an expert should be based on different grounds and different requests.

How is the period for objecting to an expert report calculated?

Two weeks and an additional period in civil cases

Under Article 281/1 of the HMK, the period is two weeks from service of the report on the party. This period is not "fifteen days". Article 92 of the HMK applies to the calculation of periods set in weeks, and Article 93 applies if the last day falls on an official holiday. The effect of the judicial recess on the period is determined separately, according to whether the case and the procedural step are subject to the recess. 1

Under the provision added by Law No. 7251, an additional period may be granted if preparing the objection is very difficult or impossible, or requires special or technical work. The request must be made within the first two weeks; the additional period may be granted once only and may not exceed two weeks. The additional period runs from the end of the first period. Making a request does not mean the additional period is granted automatically. The volume of the file, the records to be examined and the technical work required must be explained concretely. 2

In electronic service, the day the account is opened and the statutory date of service may differ. Under Article 7/a of Law No. 7201, electronic service is deemed to have been made at the end of the fifth day following the date on which it reaches the addressee's electronic address. The calculation of the period should be based on the National Electronic Notification System (UETS) records and the date of properly effected service. 7

The same period cannot be applied by rote in criminal and administrative proceedings

Article 67/5 of the Code of Criminal Procedure No. 5271 (CMK) provides for a period to be given for a new expert examination or for the notification of objections, and for a reasoned decision to be given within three days if the requests are rejected. Article 68 of the CMK contains the possibility of hearing the expert at the hearing. In a criminal file, the service document and the interim decision must therefore be read separately. 5

In administrative justice, the express reference in Article 31 of the Administrative Procedure Law No. 2577 (İYUK) makes the HMK provisions on expert evidence important. However, it cannot be assumed that all the rules of civil procedure are carried over unchanged to administrative justice. The service, the interim decision and any applicable special procedural provisions must be examined together. 6

If the period is missed, does the report become conclusive evidence?

Missing the period creates a serious procedural risk. Matters not objected to and the debates over procedurally acquired rights are assessed according to the course of the file and the relevant case law. On the other hand, a report does not acquire the character of conclusive evidence merely because it was not objected to; the court's powers under Article 281/2–3 and Article 282 of the HMK do not disappear.

These powers do not justify a party treating the period as unimportant. The safe approach is to make the errors concrete within the period. If the period has been missed, rather than acting on the thought that "the judge is not bound anyway", whether a valid procedural possibility exists should be assessed on the specific file.

How is an effective objection to an expert report prepared?

The purpose of an objection is to identify the problem that the court must review, before it is to reject the unfavorable result again and again. For this, four elements must be shown together: the finding in the report, the basis for comparison, the effect of the error on the result and the remedy sought.

The statement "the report is not scientific" does not contain these elements on its own. By contrast, if it is explained why a particular method is unsuitable and in what respects a suitable method could affect the result, a specific objection that the court must answer emerges.

The following sequence can be used when preparing an objection petition:

1. Verify the service and period record; if needed, submit the request for an additional period in time.
2. Determine whether each question in the appointment decision is answered in the report.
3. Tie each objection to the page or section of the report and to the relevant document.
4. Separate the technical error, the breach of a legal limit, the procedural deficiency and the claim of partiality.
5. Explain how the error could affect the result; if needed, submit an alternative calculation.
6. Justify the request for a supplementary report, oral explanation or new expert according to the nature of the deficiency.
7. Expressly request that objections capable of changing the result be addressed in the decision.

An illustrative request might be framed as follows: "The report's calculation section does not explain on which measurement the area was determined. The difference between the project in the file and the report directly affects the quantity multiplied by the unit price. We request a supplementary report to show the source of the measurement used, to assess the project data and to explain the effect of the difference on the result of the calculation."

This example is not a ready-made petition to paste into every file. Its value lies in connecting the fact and the requested step. Turning an unexplained difference in quantity into a claim that "the expert is biased", on the other hand, both changes the target of the criticism and creates a new allegation that must be proved.

Supplementary report, oral explanation or new expert: which is needed?

Article 281 of the HMK gives the court different tools. A supplementary report may be appropriate where the existing expertise is sufficient but a particular document, calculation or question remains incomplete. An oral explanation can serve to bring out an unclear method and the links within the report through specific questions. A new expert examination may come into question where expertise is inadequate, a conflict cannot be resolved or the problem fundamentally affects the reliability of the examination. 1

Not every objection requires a new panel to be appointed. The opposite approach can turn into obtaining reports until the desired result is reached. On the other hand, having the same expert write supplementary reports continually does not serve procedural economy if it fails to cure a structural deficiency. The principle in Article 3/7 of Law No. 6754 that a report on the same matter is obtained once should be assessed together with the possibility of a necessary new examination under Article 281/3 of the HMK. 1, 3

A request for a new examination should not merely say "another expert"; it should state which field of expertise is needed and why, and which question the earlier examination failed to resolve. This shows that the request arises from an unmet need for examination and not from dislike of the result.

The fees and expenses of an expert examination are also dealt with separately. Article 283 of the HMK takes the annual tariff as its basis; Article 324 of the HMK is important for the advance on evidence. Whether the requested examination is considered necessary, the completion of the advance and who is ultimately to bear the expense are different matters. Without knowing the type of file and the interim decision given, no single fee or fixed person liable to pay can be named. 1

What is the value of an expert opinion obtained by a party?

Article 293 of the HMK allows the parties to obtain a scientific opinion from their own expert on the event that is the subject of the case. A report by an expert appointed by the court and an expert opinion submitted by a party differ in how they are obtained. However, the fact that the opinion was obtained by a party does not justify leaving the concrete technical criticisms in it entirely unexamined. 1

A qualified expert opinion explains a specific error in the report; it shows the data used, the method and the alternative result. A text that merely repeats the party's legal claims in technical terms has limited value. The same review criteria should be applied to the expert opinion as well.

The court may hear the expert who prepared the opinion and allow necessary questions to be asked. Under Article 293/3 of the HMK, if the summoned expert does not appear without a valid excuse, the report he prepared is not taken into consideration. Furthermore, additional time cannot be requested merely on the ground that only an expert opinion will be obtained. For an extension of the period under Article 281 of the HMK, the conditions of that provision itself must be shown concretely.

How should material objections to the report be dealt with in the reasoned judgment?

The right to be heard in Article 27 of the HMK includes, besides the opportunity to explain and prove, the court's taking the explanations into account and giving concrete reasons for its decision. The court is not expected to answer every sentence separately. But it must be clear why an objection that could change the outcome of the judgment was regarded as ineffective. 1

What does the Osman Sunan decision show?

The Constitutional Court's Osman Sunan decision makes the constitutional dimension of an expert objection concrete. In a dispute concerning an immovable damaged by an earthquake, the applicant pointed to differences from assessments in other files with regard to the characteristics of the building, its area and the fault ratios. The focus of the application was not only the low level of compensation but the failure to address these objections, which could affect the result. 10

In its decision dated 25.06.2025, application no. 2021/56343, the Constitutional Court (AYM) held that the right to a reasoned decision had been violated because material allegations were not addressed with relevant and sufficient reasons. A retrial was ordered to remedy the violation. The Court did not say that the retrial must necessarily reach a particular result in the applicant's favor. [10, §§ 10–15, 20–22]

The practical consequence is this: an objection must be made concrete enough to show why the court must answer it. If the effect of a measurement difference or of a neglected record on the judgment is explained, the review of the reasoning can also be carried out on a specific issue. However, every rejected objection to a report does not by itself amount to a constitutional violation.

Repeating the objection petition is not enough on appeal

In an appeal petition (istinaf) or a petition for appeal on points of law (temyiz), the problem in the report, the objection raised in time against that problem, the court's answer and the effect of the deficiency on the judgment must be shown together. Rather than re-arguing the whole report, it should be explained which reasoning of the decision is inadequate.

As a rule, the rejection of an objection to a report does not give rise to a review on appeal independent of the main judgment; the relevant interim decision and the deficiency are raised in the appeal against the final decision. Whether the avenue of appeal is open, the time limit, the monetary threshold and special regulations are examined separately in respect of the specific decision. An individual application is likewise not an ordinary higher-level review in which technical reports are recalculated.

Which points matter especially in different kinds of disputes?

Construction and contracts for work

The examination must first separate which works and which contractual assumption the dispute concerns. The quantity of work done, the cost of remedying defects, the cost of incomplete work and works outside the contract are not the same calculation item. The date of the price used, the source of the quantity, and how tax and other elements are taken into the calculation must be explained.

If the expert chooses a method on his own before the court has determined the legal effect of the contract being lump-sum or unit-price, this can lead to a wrong result. However, generalizing the calculation method applied in one particular decision to all contracts for work is equally objectionable. The specific contract and claim should be examined first, and then the technical calculation suited to that assumption.

Employment receivables

As to wages, period of work, work pattern and payments, the evidence on which the report is based must be shown. It must be checked whether the witness knew the whole period, to which receivable a bank payment relates, and whether the same assumption has been applied to different periods.

The expert's calculation cannot replace the court's assessment of witness credibility or of the legal consequence of a limitation defense. For disputed assumptions, an alternative calculation makes it easier for the court to reach a clear decision. By contrast, if it is unclear why the alternatives were produced, preparing many calculations does not in itself help.

Medical liability and traffic losses

In medical disputes, the examination must be related to the conditions at the time of the intervention and the relevant field of expertise. The existence of an adverse outcome is not the same as a departure from the professional standard. Departure from the standard, causation and the extent of the loss must be assessed through separate questions. This context can be read together with the explanations on medical malpractice.

In a traffic dispute, on the other hand, the manner in which the event occurred, the technical fault assessment, the determination of injury or disability and the calculation of the loss may require different kinds of expertise. The adequacy of a report in one field does not remove the need for examination in the others. Insurance coverage and legal liability are assessed separately; the explanations on traffic accidents and the insurance relationship address the other side of this distinction.

Are the complaint and compensation routes the same for an erroneous report?

An objection to the report, a challenge to the expert, an application to the regional board, a compensation action and a criminal complaint serve different purposes. Resorting to one does not automatically change the period or conditions of another.

The regional expert-witness board (bilirkişilik bölge kurulu) reviews the expert's conduct and the report's compliance with the legislation. However, under Article 14/3–4 of Law No. 6754, it cannot review the report as to the accuracy of the special or technical knowledge; applications of this kind are rejected without examination. Applying to the regional board merely to change the result of a calculation therefore does not replace an objection in the proceedings. 3

As for civil liability, Article 285 of the HMK requires that loss has arisen because a report that is untrue as a result of intent or gross negligence was used as the basis of a judgment, and provides for a compensation action against the State. An unfavorable report or an ordinary difference of opinion does not by itself show that these conditions are met. The competent judicial authority is determined under the special provision in Article 286 of the HMK. The one-year period in Article 287 of the HMK, however, relates to the State's right of recourse against the expert; it cannot be presented as a general limitation period for suit available to everyone who suffers loss. 1

As for criminal liability, the offense of untruthful expert evidence in Article 276 of the Turkish Penal Code (TCK) is subject to separate conditions. Technical criticism must not be confused with an allegation of intentional untruth. A criminal complaint should be assessed in the light of the specific act and evidence thought to constitute an offense, not as a means of changing the report through pressure. 8

Conclusion

Expert evidence should meet the court's need for technical knowledge without making the responsibility for adjudication invisible. For this, it is not enough merely to draw the limits of the expert; the appointment questions must be framed correctly, the data used must be opened to discussion, and it must be explained how the report was carried into the judgment.

A reviewable report does not merely announce a result; it also shows which assumptions that result depends on. An effective objection does not merely oppose; it sets out the error, its basis, its effect on the result and the appropriate remedy. A reasoned decision, for its part, does not merely refer to the report; it explains why that technical assessment was relied on and why the material objections did not change the result.

The value of technical knowledge in proceedings appears in the clarity of the reasoning before it appears in the weight of a title. The judge's discretion likewise acquires meaning through the responsibility of reviewing this reasoning and personally assuming the legal outcome.

Frequently Asked Questions

Does an expert report bind the judge?

No. Under Article 282 of the HMK, the judge freely assesses the report together with the other evidence. However, while the need for special or technical knowledge continues, the judge cannot reject the report and resolve a matter requiring expertise on personal conviction. An incomplete examination must be remedied by the appropriate procedural tool.

Is the period for objecting to an expert report fifteen days?

In civil cases, the statutory period is two weeks from service. The expression "fifteen days" is incorrect. The validity of service, the date of electronic service, the last day falling on an official holiday and the applicable judicial recess provisions are also taken into account separately in calculating the period.

Can additional time be obtained for the objection?

If the conditions in Article 281/1 of the HMK are met, an additional period of at most two weeks may be requested, once only, by applying within the first two weeks. The additional period does not arise automatically. It must be explained concretely why preparation is very difficult, impossible or dependent on special technical work.

Is a new expert appointed after every objection?

No. Depending on the nature of the problem, the court may order a supplementary report, an oral explanation or a new expert examination. The request should explain which deficiency the existing examination failed to cure. An unfavorable result alone is not a sufficient ground for appointing a new panel.

When reports conflict, is the latest one relied on?

Being the most recent does not give a report automatic precedence. First, it is determined whether the reports relate to the same data, period and question. Genuine differences that affect the result must be clarified, and the reasons why the preferred report was found more suitable must be given.

Does the presence of a legal assessment in the report invalidate the entire report?

Legal characterization and assessment exceed the expert's task. Whether this can be separated from the technical findings, and whether it affects the whole calculation, is examined separately. Removing the legal conclusion does not in every case correct a flawed calculation built on that assumption.

Is a challenge to the expert the same as an objection to the report?

No. A challenge concerns grounds of disqualification or impartiality relating to the expert personally; an objection to the report concerns deficiencies in the examination and its assessments. The period of at most one week from learning of the grounds of challenge in Article 272 of the HMK is separate from the two-week period for objecting to the report.

If no objection is made, does the report become final?

The report does not become final like a court judgment and does not turn into conclusive evidence. Even so, failing to object in time may seriously affect a party's procedural position. The objection period should not be allowed to pass in reliance on the court's power to examine matters of its own motion.

Can the regional expert-witness board correct the calculation in the report?

The regional board is not a higher expert authority that reviews the accuracy of the report's special or technical knowledge. A technical objection to the calculation must be directed to the authority conducting the proceedings. Taking an allegation of an ethical or regulatory breach to the regional board is a separate route of application.

Is failure to address a material objection always a rights violation?

Not every rejected objection amounts to a violation of rights. The objection's relevance to the dispute, its capacity to affect the result and the court's reasoning are assessed together. The Osman Sunan decision shows that leaving technical objections that affect the result unanswered may violate the right to a reasoned decision.

Sources

1. Code of Civil Procedure No. 6100: In particular Articles 25, 27, 92–94, 145, 190, 194, 266–287, 293 and 324. Copy of the consolidated text held by a public university; Ministry of Justice compilation of the expert-witness provisions. The Ministry compilation was read together with 2 for the period provision later added to Article 281.

2. Law No. 7251, Article 24: The additional-period provision added to HMK Article 281/1. Text as adopted by the Grand National Assembly (TBMM).

3. Expert Witness Law No. 6754: In particular Articles 3 and 14. Ministry of Justice text.

4. Expert Witness Regulation: In particular Articles 5, 7–9, 51, 53–56 and 59–62. Ministry copy including the 2025 amendments.

5. Code of Criminal Procedure No. 5271: Articles 63, 67 and 68. Ministry of Justice compilation of the relevant provisions.

6. Administrative Procedure Law No. 2577: Article 31. Ministry of Justice compilation of the relevant provision.

7. Notification Law No. 7201: Article 7/a. PTT explanations on electronic service; PTT legislation links.

8. Turkish Penal Code No. 5237: Article 276. Ministry of Justice compilation of the relevant provisions.

9. Civil General Assembly of the Court of Cassation (Yargıtay Hukuk Genel Kurulu), 05.07.2023, E. 2023/487, K. 2023/708; in particular §§ 25–30, 35–41. Full text of the decision, as reproduced by Hukuki Haber.

10. Constitutional Court (Anayasa Mahkemesi), Osman Sunan, application no. 2021/56343, 25.06.2025; in particular §§ 10–15, 20–22. Full text of the decision, as reproduced by Hukuki Haber. The identity of the decision was checked against the Constitutional Court decision-bank index; the review of the reasoning was carried out on the accessible full text.

11. Murat Atalı, "6754 Sayılı Bilirkişilik Kanunu ve Hukuki Konularda Bilirkişilik" (Expert Witness Law No. 6754 and Expert Evidence on Legal Issues), Ankara Üniversitesi Hukuk Fakültesi Dergisi, 65(4), 2016, pp. 3271–3282. Publication record; full text.

12. Özer Alişan Ekren, article series "Bilirkişilikte Hukuki Sınır, Denetime Elverişlilik ve Hâkimin Takdir Yetkisi" (Legal Limits, Reviewability and the Judge's Discretion in Expert Evidence): I, II, III, Hukuki Haber, 2025. These are the sources on the topic suggested by the user; the structure and the practical framework of this article were prepared independently, and the legal propositions were reviewed separately.