One of the most frequently discussed evidence issues in criminal proceedings is conviction based on single witness statement. "Is what the witness said sufficient? Should other evidence be sought?" The question has been on the agenda for many years both in law faculties and in practice. In this article, the legal framework of the issue and the established approach of the Supreme Court are discussed.
Reminder: For informational purposes only; The decision to be made in the concrete file is within the discretion of the judge.
Legal Framework
Turkish criminal procedure is based on the principles of "freedom of evidence" and "conscientious conviction of the judge" (CMK article 217/1). The judge considers the crime to be proven by all kinds of evidence in accordance with the law; However, the decision he makes must be in accordance with reason, logic and all the evidence in the file.
At the same time, the principle of "the benefit of the doubt" (in dubio pro reo); It requires that every reasonable doubt about the commission of the crime be evaluated in favor of the defendant. When these two principles are evaluated together, the issue of conviction based on a single witness statement requires a meticulous examination.
Single Witness Insufficiency Approach
According to the established jurisprudence of the Supreme Court, a single witness statement is not considered sufficient for conviction unless supported by other evidence. The main reasons for this approach:
- The fallibility of human perception and memory (misdiagnosis, memory errors)
- Possibility of the witness making a statement out of subjective interest or hostility
- Situations where the opportunity to cross-examine the witness is insufficient
- Witness statements may create contradiction
Exception: Can One Witness Be Considered Sufficient?
The Supreme Court accepts that a single witness statement can also be used as a basis for conviction when certain conditions are met. These conditions:
- The witness statement must be reliable, consistent, sincere and detailed
- Presence of objective material evidence (camera recording, fingerprints, autopsy report, scar, medical report, etc.) to support the statement
- There should be no conflict of interest or hostility between the witness and the defendant
- The statement must be in accordance with the natural flow of the event
- Effective cross-examination of the witness should have been conducted
Special Situation of Victim Declaration
In crimes that typically occur between two people, such as sexual assault, domestic violence, insults and threats, the only witness is often the victim herself. In these cases:
- The victim statement alone can be used as a basis for conviction; However, the reliability of the statement must be evaluated meticulously.
- Seeking supporting evidence such as doctor's report, psychological evaluation, message/correspondence, witness statements, camera recording is strongly emphasized by the Supreme Court.
- If there is a contradiction between the victim's statement and the defendant's defense, both possibilities must be evaluated meticulously.
The 14th Criminal Chamber of the Supreme Court of Appeals has frequently emphasized the criterion in sexual assault/abuse files that "the victim's statement must be consistent within itself, sincere and in line with the ordinary flow of life"; It sought to eliminate the contradictions and inconsistencies in the victim statements with additional evidence.
Precedent Decisions (Reference)
The following principles reflect the established approach of the Supreme Court:
- Supreme Court Criminal General Assembly - Insufficiency of Single Witness: For a conviction based on a single witness statement, this statement must be supported by other concrete evidence; Otherwise, it has been jurisprudence that it is appropriate to give an acquittal decision in accordance with the principle of "the defendant benefits from the doubt".
- Supreme Court 14th Criminal Chamber - Sexual Crime Victim Statement: The reliability of the victim's statement is required to be supported by concrete evidence (health report, messaging, camera recording, witnesses); The contradiction between the victim's statement and the defendant's defense must be resolved.
- The 4th Criminal Chamber of the Supreme Court of Appeals - Insult/Threat Cases: In events that took place between two people, the victim's statement is not considered sufficient on its own unless it is supported by additional evidence in the face of the defendant's consistent denial.
- Supreme Court of Appeals 6th Criminal Chamber - Theft/Plunder: In convictions based on the identification statement of a single eyewitness, it is an established practice that the identification procedure has been carried out duly and additional digital/material evidence has been sought.
- Constitutional Court - Right to Fair Trial: The Constitutional Court has determined in various decisions that the inadequacy of the court's justification and the restriction of the defense's right to cross-examination are grounds for violation in individual application decisions and convictions based on a single witness statement.
Right to Cross-Examination (CMK Article 201)
The defendant, his defense attorney and the participating party have the right to directly ask questions to the witness (CMK article 201). Restricting this right brings into question a violation of ECHR Article 6/3-d (the defendant's right to question witnesses). It is of great importance to use this right effectively in order to object to witness statements.
Evaluation Differences According to Witness Type
1) Direct Eyewitness
The statement of the person who saw the incident personally has the highest evidentiary value. However, factors such as psychological factors, viewing angle, light and distance are evaluated.
2) Hearsay
The statement of the witness who heard the incident from someone else is weak evidence; As a rule, it alone is not considered sufficient for conviction. The main witness must be heard.
3) Relative or Close Witness
The statements of witnesses who have a relationship of kinship, hostility or interest with the defendant are evaluated after this situation is notified to the defendant and taken into consideration by the court (CMK art. 45-49).
4) Child Witness
The statements of child witnesses should be taken under the supervision of a child development specialist and with a special procedure. Age, comprehension ability and risk of suggestion are evaluated.
5) Anonymous/Secret Witness
Special rules apply for confidential witness statements within the scope of Law No. 3713 and CMK Article 58. For details, you can see our article Conviction Based on Secret Witness Statement.
Practical Considerations for Defense
Conclusion
The established approach of the Turkish judiciary is that a single witness statement, as a rule, is not considered sufficient for conviction on its own, and must be supported by strengthening evidence. The exception to this is; This may be the case if the statement is consistent, sincere, detailed and compatible with other elements in the file. Even though the victim statement has a special status, it is still the preferred approach to support it with supporting evidence. Since the fact pattern of each file is different, the outcome is specific to the file and is determined by the judge's discretion.