Confidential Criminal Investigation in Turkey: Can Foreigners Access the File? 2026 Guide

Can a foreigner or lawyer access a confidential criminal investigation file in Turkey? Learn the 2026 rules on investigation secrecy, file access, restriction orders, excluded documents, detention rights, evidence, and legal remedies.

A foreign national who learns that a criminal investigation has been opened in Turkey may be told that the file is “confidential,” “restricted,” or unavailable because the investigation is still ongoing.

This often creates immediate concern: Can the foreigner see the criminal investigation file? Can their lawyer obtain copies? Can the prosecutor hide all evidence? Which documents remain accessible despite a restriction order? When does the restriction end?

The general rule under Article 153 of Criminal Procedure Code No. 5271 is that defense counsel may examine the contents of the investigation file and obtain copies of requested documents without charge.

However, Turkish law permits an important exception. For the categories of offences specified by Article 153, where access could endanger the purpose of the investigation, the defense lawyer’s authority to inspect the file or obtain copies may be restricted by a peace criminal judge upon the public prosecutor’s request. The Constitutional Court has confirmed that this is not an unlimited authority to make the entire defense process inaccessible.

For foreign suspects, the distinction between ordinary investigation confidentiality and a formal restriction of defense access is extremely important.

Are All Criminal Investigations in Turkey Confidential?

The investigation stage is generally conducted under confidentiality principles. This protects the effectiveness of the investigation, the presumption of innocence, privacy, evidence, and the interests of persons involved.

However, investigation confidentiality does not automatically mean that the suspect’s defense lawyer is prohibited from examining the file.

These are different concepts.

The Constitutional Court has explained that Article 153 establishes defense counsel’s general right to examine an investigation file and obtain copies. A specific statutory restriction can be imposed only within the legal framework established for that purpose.

Therefore, when authorities say that a file is “confidential,” counsel should determine whether they mean:

• The ordinary confidentiality of an ongoing investigation, or
• A formal judicial restriction order limiting defense access under Article 153.

The legal consequences are different.

Can a Foreign Suspect’s Lawyer Access the Investigation File?

As a general rule, yes.

Article 153 gives defense counsel authority to examine the investigation file and obtain copies of requested documents without charge.

This access can be critical for determining:

• What offence is being investigated
• What conduct is attributed to the foreigner
• Who made the complaint
• Which transactions are questioned
• What witness statements exist
• Whether digital evidence has been collected
• Whether bank records have been obtained
• Whether searches or seizures occurred
• Whether expert reports exist
• Whether the suspect faces detention risk

The Constitutional Court has emphasized that early file access is closely connected with the ability of defense counsel to prepare an effective defense and challenge restrictive measures imposed against the suspect.

Can the Prosecutor Restrict Access to the File?

A prosecutor cannot simply create an unlimited restriction by declaring the file secret.

Under the Article 153 mechanism, where the statutory conditions exist, the public prosecutor may request a restriction and the peace criminal judge decides whether defense counsel’s authority to examine the file or obtain copies will be restricted.

The Constitutional Court has explained that the restriction is available only within the scope defined by Article 153 and where disclosure could endanger the purpose of the investigation.

This distinction is significant.

There should be a legally recognizable restriction decision rather than a general assertion that “the investigation is confidential.”

Can a Restriction Order Be Issued in Every Criminal Investigation?

No.

Article 153 does not provide an unrestricted mechanism applicable to every alleged offence.

The Constitutional Court has expressly described the restriction mechanism as being limited to the categories of offences specified in Article 153 and situations in which access could endanger the purpose of the investigation.

Therefore, defense counsel should examine:

What offence is under investigation?

Is that offence within the statutory restriction framework?

Does a judicial restriction decision actually exist?

What exactly does the decision restrict?

A restriction should not simply be assumed because the investigation is sensitive or complicated.

Does a Restriction Order Allow Authorities to Hide the Entire File?

Not without limits.

The Constitutional Court has specifically stated that Article 153 does not grant judges an absolute authority to impose unlimited secrecy over the investigation file.

Restrictions must remain connected to the purpose of protecting the investigation and must not interfere with defense rights in a disproportionate manner.

This means that defense counsel should not stop the analysis after being told that a restriction order exists.

The next question should be:

Which materials remain accessible despite the restriction?

Which Documents Remain Accessible Despite a Restriction Order?

This is one of the most important protections under Article 153.

Official Ministry of Justice materials explain that even where a restriction decision exists, certain materials cannot be withheld from defense counsel under that restriction mechanism.

These include:

• Records containing the suspect’s statement
• Expert reports
• Records concerning judicial proceedings at which the suspect is legally entitled to be present

The same official material explains that these exceptions apply despite an investigation-stage restriction.

Therefore, “restricted investigation” does not necessarily mean “no documents available.”

Defense counsel should identify the accessible documents individually.

Can the Foreigner Obtain Their Own Police Statement?

A restriction order should not prevent defense access to the record containing the suspect’s own statement under the Article 153 framework.

This can include records documenting statements previously made during the criminal investigation. Official Ministry of Justice materials expressly identify suspect-statement records among the materials that remain outside the restriction.

This is important because the statement may later be compared with:

• Prosecutor questioning
• Judicial questioning
• Witness evidence
• Digital records
• Bank transactions
• Other documentary evidence

A foreign suspect should know exactly what was officially recorded as their previous statement.

Can Expert Reports Be Hidden?

Article 153 provides special protection for expert reports.

Official Ministry of Justice materials state that expert reports remain among the documents that cannot be withheld through the ordinary Article 153 restriction mechanism.

Depending on the investigation, expert evidence may include reports concerning:

• Digital forensic examinations
• Medical evidence
• Financial analysis
• Document examination
• Technical evidence
• Scientific analysis

These reports may become extremely important when preparing the defense.

Can the Foreigner Personally Examine the File?

There is an important practical distinction between the rights and procedures applicable to the suspect personally and those exercised through defense counsel.

For a foreign suspect, appointing Turkish criminal counsel is often the most effective way to determine what information can lawfully be obtained during the investigation.

Counsel can identify:

• Investigation number
• Prosecutor’s office
• Alleged offence
• Accessible documents
• Existence of a restriction order
• Scope of the restriction
• Evidence that remains accessible
• Existing procedural measures

This can be particularly important where the foreigner is outside Turkey.

What If the Foreigner Is Outside Turkey?

A foreign national does not necessarily need to travel to Turkey merely to discover the basic procedural status of an investigation.

Legal counsel may first investigate available information and determine whether the person is:

• Named as a suspect
• Being sought for a statement
• Subject to a formal summons
• Subject to compulsory appearance
• Subject to an arrest warrant
• Connected to a restricted investigation file

This can be particularly important for foreign investors, executives, former residents, employees, and tourists considering returning to Turkey.

An investigation file and an arrest warrant are not the same thing.

A restricted investigation likewise does not automatically mean that an arrest warrant exists.

Can a Lawyer Learn the Charges Even If the File Is Restricted?

Potentially, yes.

A restriction on access to parts of the investigation does not mean that the foreign suspect can lawfully be kept completely unaware of the accusation while authorities seek coercive measures against them.

The Constitutional Court has repeatedly examined whether suspects had access to the essential factual and evidentiary basis necessary to exercise defense rights effectively.

In one line of cases, the Court considered whether applicants and their lawyers possessed the essential information underlying the accusation despite restrictions on broader file access.

The practical question is therefore not simply:

“Is there a restriction order?”

It is also:

“Does the suspect have sufficient information about the accusation and essential evidence to defend against the measures imposed?”

What If the Foreigner Is in Pre-Trial Detention?

File access becomes especially important where the suspect’s liberty has been restricted.

The Constitutional Court’s guidance recognizes that a detained suspect must have effective access to prosecution material necessary to challenge detention.

This principle does not necessarily require unrestricted disclosure of every investigative document immediately.

However, the defense must have enough information concerning the essential grounds and evidence supporting detention to make judicial review meaningful.

This remains a significant issue in current constitutional review. In a September 2025 decision, the Constitutional Court found a violation of the constitutional right to liberty and security in relation to restriction of access to an investigation file.

Can the Defense Challenge a Restriction That Prevents an Effective Detention Objection?

The restriction should be examined together with the suspect’s ability to challenge deprivation of liberty effectively.

If counsel cannot determine the essential evidence relied upon for detention, arguments may arise concerning:

• Effective judicial review
• Equality of arms
• Ability to challenge the evidence
• Right to liberty and security
• Defense rights

The Constitutional Court’s materials recognize the importance of access to relevant prosecution evidence when a detained person is challenging the legality of detention.

Accordingly, a restriction order should not make a detention challenge purely theoretical.

Does the Foreigner Have the Right to Know the Criminal Accusation?

Yes.

File access and notification of the accusation are related but separate rights.

A suspect should understand what alleged criminal conduct is being attributed to them when authorities take a statement or seek restrictive measures.

Even where the defense cannot inspect every document, the suspect should not be required to defend against a completely unidentified allegation.

For example, a foreigner investigated for alleged financial fraud should ordinarily need sufficient information to understand matters such as:

• Relevant transaction
• Approximate period
• Alleged conduct
• Nature of suspected criminal involvement

Without meaningful information about the accusation, preparing an effective defense becomes extremely difficult.

Can the Foreigner Request an Interpreter When the Charges Are Explained?

Yes.

Where the foreign suspect cannot adequately communicate in Turkish, interpretation safeguards apply under Turkish criminal procedure.

This becomes especially important in confidential investigations because the suspect may have only limited opportunities to learn the exact factual allegations.

A competent interpretation should allow the foreigner to understand:

• Alleged offence
• Factual accusation
• Questions
• Procedural rights
• Their recorded answers
• Relevant judicial decisions

A foreign suspect should not sign a statement without understanding what has been recorded.

Can the Lawyer Obtain Digital Copies of Accessible Documents?

Where the lawyer has a right to examine documents under Article 153, the statutory framework also recognizes the ability to obtain copies of accessible materials without charge.

The practical method of obtaining or reviewing documents can depend on the judicial information systems and the prosecutor’s office handling the investigation.

The critical issue is the legal scope of access.

If access is refused, counsel should determine whether the refusal is based on:

• A formal restriction decision
• The type of document requested
• Another specific statutory limitation
• A procedural or administrative issue

This distinction may determine the appropriate legal response.

What Happens If There Is No Formal Restriction Order?

If authorities deny defense counsel access merely by saying “the investigation is confidential,” counsel should determine the legal basis of that refusal.

The general rule under Article 153 is defense access.

The Constitutional Court has emphasized that restrictions constitute an exception and that the statutory restriction power is limited.

Therefore, ordinary investigation confidentiality should not automatically be treated as equivalent to a valid Article 153 restriction.

Can Confidentiality Protect Witnesses or Third Parties?

Protection of witnesses, victims, third parties, privacy, national security interests, and investigative methods may justify limitations in appropriate circumstances.

Official Ministry of Justice materials recognize that restrictions on particular evidence may serve legitimate purposes such as protecting third-party rights, public interests, or investigative methods. However, those materials also emphasize that restrictions must remain proportionate and cannot prevent adequate exercise of defense rights.

The correct balance depends on the circumstances of the individual investigation.

What If the File Contains Secret Witness Evidence?

Investigations involving protected or confidential witnesses may raise additional access issues.

Defense counsel should determine:

• What allegation is based on the witness
• Whether other evidence corroborates the statement
• Whether the witness evidence supports a detention measure
• What information can legally be disclosed
• Whether meaningful challenge is possible

The existence of confidential information does not automatically eliminate all defense rights.

What If the File Contains Digital Evidence?

Restricted investigations increasingly involve:

• Mobile-phone extractions
• Messaging applications
• Emails
• Cloud data
• Computer records
• IP information
• Location information
• Social-media evidence

A defense lawyer should determine whether forensic reports are accessible and whether the digital material relied upon against the foreigner can be meaningfully challenged.

Important questions may include:

• Was the digital search lawfully authorized?
• What device was examined?
• Who controlled the device?
• What period was searched?
• Was the evidence forensically preserved?
• Was the material complete?
• Were messages taken out of context?

A restriction order should not prevent the defense from identifying legal objections that can properly be raised against digital evidence.

Confidential Financial Crime Investigations

Foreign executives and investors frequently encounter restricted or sensitive investigations involving:

• Fraud
• Money transfers
• Company funds
• Banking transactions
• Customs allegations
• Forged documents
• Tax-related offences
• Cybercrime
• Commercial transactions

In such cases, the investigation may contain large quantities of bank records, corporate documents, communications, and expert analysis.

Once counsel identifies the core allegation, the foreign suspect may begin preserving exculpatory evidence such as:

• Contracts
• Invoices
• Bank records
• Accounting documents
• Board resolutions
• Emails
• Corporate authorizations
• Travel records

The existence of a restriction should not cause the defense to remain passive.

Can a Foreign Company Hire a Lawyer to Examine an Investigation Concerning Its Executive?

Yes, but representation and defense relationships must be structured carefully.

The interests of:

• The company
• Shareholders
• Directors
• Employees
• Individual suspects

may not always be identical.

A company may wish to understand whether the investigation affects its operations, documents, assets, or personnel, while an individual executive may require separate personal criminal defense.

Potential conflicts of interest should therefore be evaluated early.

When Does the Investigation File Restriction End?

An important statutory safeguard applies when the case moves from investigation to prosecution.

Official Ministry of Justice materials state that the Article 153 investigation-stage restriction ends automatically when the indictment is accepted by the court. At that stage, defense counsel may examine the case file and preserved evidence and obtain copies of the relevant records and documents.

This means that an investigation restriction is not intended to continue indefinitely throughout the criminal trial.

What Happens After the Indictment Is Accepted?

Once the indictment is accepted, the case enters the prosecution stage.

The defense must then be able to prepare for trial against the allegations formally brought before the criminal court.

The indictment should identify the alleged conduct and legal accusation forming the basis of the prosecution.

Defense counsel can then analyze:

• Indictment
• Evidence
• Witness statements
• Expert reports
• Digital material
• Search and seizure records
• Financial records
• Other prosecution evidence

The defense can prepare objections, evidence requests, expert challenges, and trial strategy.

Can the Foreigner Challenge Evidence Once Access Is Obtained?

Yes.

File access is valuable because it allows the defense to move beyond speculation.

Once the relevant evidence is known, counsel may challenge:

• Unlawfully obtained evidence
• Inaccurate witness statements
• Incorrect expert conclusions
• Digital evidence integrity
• Incorrect bank-transfer interpretation
• False documentary allegations
• Improper search and seizure
• Lack of individual criminal responsibility

A foreign suspect should not assume that evidence appearing in an investigation file is automatically correct or legally admissible.

Can the Foreigner Submit Evidence While the Investigation Is Confidential?

Yes, where appropriate.

A restriction on access does not necessarily prevent the suspect from presenting evidence in their own favor.

For example, if the foreigner understands that a particular bank transfer is being investigated, the defense may submit:

• Contract
• Invoice
• Correspondence
• Bank statement
• Delivery document
• Corporate authorization

Strategic timing should nevertheless be considered carefully.

Defense counsel should avoid revealing unnecessary information or making speculative explanations before understanding the allegation sufficiently.

What Should a Foreigner Do After Learning That the Investigation File Is Restricted?

A practical defense strategy is to:

1. Confirm the investigation number.
2. Determine the prosecutor’s office handling the file.
3. Confirm whether the person is formally a suspect.
4. Identify the alleged offence.
5. Determine whether a judicial restriction order actually exists.
6. Examine the scope of the restriction.
7. Identify documents that remain accessible under Article 153.
8. Obtain the suspect’s previous statement records.
9. Examine accessible expert reports.
10. Determine whether detention or another coercive measure exists.
11. Assess whether the restriction prevents effective challenge to detention.
12. Preserve independent defense evidence.
13. Avoid deleting digital records.
14. Prepare carefully before any further police or prosecutor statement.
15. Monitor when the restriction is lifted or the indictment is accepted.

Frequently Asked Questions

1. Can a foreigner’s lawyer examine a confidential criminal investigation file in Turkey?

As a general rule, defense counsel may examine the investigation file and obtain copies under Article 153. Access can be restricted only within the statutory framework.

2. Does investigation confidentiality automatically prevent the lawyer from seeing the file?

No. Ordinary investigation confidentiality and a formal judicial restriction on defense access are different concepts.

3. Who can restrict the defense lawyer’s access?

For the Article 153 restriction mechanism, the public prosecutor requests the restriction and the peace criminal judge decides whether the statutory conditions are satisfied.

4. Can access be restricted in every criminal case?

No. The Constitutional Court describes the Article 153 restriction as limited to the offences specified by the provision and circumstances where access could endanger the purpose of the investigation.

5. Can the entire investigation file be hidden from the lawyer?

The restriction power is not absolute. The Constitutional Court has expressly emphasized that Article 153 does not grant unlimited authority to restrict the entire defense process.

6. Which documents remain accessible despite a restriction?

Official Ministry of Justice materials identify suspect-statement records, expert reports, and records concerning proceedings at which the suspect is legally entitled to be present as documents outside the ordinary restriction mechanism.

7. What if the foreigner is detained and cannot see the evidence?

The defense must have sufficient access to essential material to challenge detention effectively. The Constitutional Court treats access to relevant prosecution evidence as an important component of effective judicial review of detention.

8. Can a foreigner check a restricted investigation before returning to Turkey?

Counsel may seek to determine the person’s procedural status, accessible allegations, existence of a restriction order, and whether separate compulsory measures have been issued. A restricted investigation does not automatically mean that an arrest warrant exists.

9. When does the Article 153 restriction end?

Official Ministry of Justice materials state that the investigation-stage restriction ends automatically when the indictment is accepted by the criminal court.

10. What should a foreigner do if authorities say the file is completely confidential?

The foreigner should have criminal counsel determine whether a formal judicial restriction exists, what its scope is, which documents remain accessible, and whether the limitation interferes with the ability to challenge detention or another coercive measure.

Legal Support for Foreigners Facing Confidential Criminal Investigations in Turkey

A restricted criminal investigation can place a foreign national in a difficult position. The person may know that Turkish authorities are investigating them while having only limited information about the complaint, evidence, witnesses, financial transactions, or digital records involved.

The existence of confidentiality should not automatically be interpreted as meaning that the defense has no rights.

Fırat Fesih Kaya Law Office provides criminal-law assistance to foreign nationals, foreign employees, international executives, investors, tourists, students, residence-permit holders, and foreign-owned companies facing criminal investigations in Turkey.

Lawyer Fırat Fesih Kaya assists foreign clients with investigation-file access, Article 153 restriction decisions, confidential investigations, examination of accessible evidence, police and prosecutor statements, detention proceedings, digital evidence, financial investigations, arrest-risk assessment, and preparation of criminal-defense strategies.

Early legal review can help determine what information is legally accessible, whether a valid restriction order exists, which documents remain available despite the restriction, and what defense measures should be taken before further questioning or judicial proceedings.

Phone: +90 312 434 22 22
Mobile: +90 532 769 22 22
Email: info@firatfesihkaya.av.tr
Address: Mevlana Boulevard No:221, Yıldırım Tower No:148, 06520 Balgat, Çankaya, Ankara, Turkey

This publication is provided for general informational purposes and does not constitute legal advice. Access to a confidential investigation file must be evaluated according to the alleged offence, procedural stage, existence and scope of any judicial restriction decision, detention status, and legislation applicable to the individual investigation.