Same Conduct Is Investigated in Turkey and Abroad: Can a Foreigner Be Prosecuted Twice? (2026 Updated Guide)

Can a foreign national face criminal proceedings in Turkey after being investigated, acquitted or convicted abroad for the same conduct? Learn about double prosecution, foreign judgments, jurisdiction, extradition, evidence and defense strategies in Turkey.

A foreign national may discover that the same transaction, financial transfer, online communication, commercial activity or alleged criminal conduct is being investigated both in Turkey and in another country. This creates an immediate question: Can Turkey prosecute a foreigner for conduct that has already been investigated or prosecuted abroad? There is no universal rule that every foreign investigation automatically prevents Turkish proceedings. The answer depends on matters including Turkish criminal jurisdiction, where the offense was committed, the nationality of the suspect and victim, the nature of the offense, the result of the foreign proceedings and the specific statutory rules applicable to prosecution in Turkey.

For a foreign suspect or defendant, the existence of proceedings abroad should therefore be raised immediately rather than assuming that Turkish prosecutors will automatically know about or give effect to the foreign case.

Can the Same Conduct Be Investigated in Two Countries?

Yes, this can occur. Modern criminal investigations frequently involve conduct connected with several jurisdictions. International bank transfers, online fraud allegations, cryptocurrency transactions, multinational companies, cross-border commercial dealings and electronic communications can generate investigative connections with more than one country.

The fact that another country has opened an investigation does not, by itself, necessarily prevent Turkish authorities from investigating conduct over which Turkey claims criminal jurisdiction.

What Does the Double Jeopardy Principle Mean?

The basic concept is that a person should not repeatedly face criminal proceedings for the same offense after a legally significant final determination. In international cases, however, applying this principle can be considerably more complicated than where both proceedings take place within a single legal system.

A foreign judgment must therefore be analyzed together with the Turkish rules governing international criminal jurisdiction.

Does a Foreign Criminal Case Automatically Stop the Turkish Case?

Not necessarily. The existence of proceedings abroad and the legal effect of those proceedings in Turkey are separate questions.

The Turkish prosecutor or court must determine whether Turkish law permits or requires proceedings and what significance should be attributed to the foreign investigation or judgment.

Turkish Criminal Jurisdiction Must Be Examined First

Before focusing exclusively on double prosecution, determine why Turkey claims jurisdiction.

Important questions include where the alleged conduct occurred, where its consequences arose, whether part of the offense occurred in Turkey, whether the suspect or victim has a relevant connection with Turkey and whether special jurisdiction rules apply to the alleged offense.

What If Part of the Crime Occurred in Turkey?

Cross-border offenses rarely occur entirely in one location. A suspect may send instructions from abroad while money is transferred through Turkey, or an online communication may originate in one country and cause consequences in another.

These territorial connections can become important when Turkish jurisdiction is assessed.

What If the Foreigner Committed the Alleged Offense Abroad?

Turkish criminal law contains rules addressing certain offenses committed outside Turkey. Whether Turkey can prosecute depends on the particular jurisdictional basis and statutory conditions.

A defense should therefore identify the alleged place of commission rather than accepting a broad statement that the offense was simply “international.”

Foreign Investigation and Foreign Conviction Are Different

A pending foreign investigation does not have the same legal significance as a final judgment.

The Turkish authorities should be informed whether the foreign proceeding resulted in dismissal, non-prosecution, acquittal, conviction or remains pending.

What If the Foreigner Was Acquitted Abroad?

A final foreign acquittal can be highly important, but its effect in Turkey must be assessed under the particular jurisdictional rules governing the alleged offense.

The defense should obtain the complete judgment rather than merely presenting an informal statement that the person was “cleared.”

What If the Foreigner Was Convicted Abroad?

A foreign conviction can also have significant consequences. The Turkish court may need to examine the nature of the foreign judgment, sentence imposed, sentence served and the statutory basis for any Turkish proceedings.

The foreign sentence should never be concealed.

Time Served Abroad Can Become Important

Where Turkish law permits proceedings despite a foreign conviction, punishment already served abroad may become relevant under the applicable rules.

The defense should therefore document arrest, detention, imprisonment and other execution periods accurately.

Obtain the Final Foreign Judgment

The strongest evidence is generally the official decision itself.

The document should identify the accused, allegations, relevant conduct, dates, legal characterization, outcome and whether the decision has become final.

Obtain the Foreign Indictment or Charging Document

The foreign judgment alone may not reveal the full factual scope of the case.

The indictment or equivalent charging document can help demonstrate precisely which conduct was prosecuted abroad.

Compare the Conduct, Not Only the Offense Names

Two countries may use different names for substantially the same alleged conduct.

For example, one jurisdiction may characterize conduct as fraud while another uses terminology relating to deception, computer misuse or financial crime.

The factual acts should therefore be compared rather than relying solely on the titles of the offenses.

Compare the Relevant Dates

Determine whether the Turkish and foreign proceedings concern the same transaction period.

If one case concerns transfers made in January and another concerns separate transfers made in June, the cases may not actually involve identical conduct.

Compare the Victims

The identity of alleged victims can also matter. A broader scheme involving multiple victims may create overlapping but not necessarily identical proceedings.

Prepare a transaction-by-transaction comparison where necessary.

Compare the Financial Transactions

For financial crime allegations, create a table identifying the account, transfer date, amount, sender, recipient and alleged purpose of each transaction.

This can demonstrate whether Turkey is investigating the same transactions already adjudicated abroad or additional conduct.

Foreign Evidence Should Be Preserved

The defense should collect police records, prosecutor decisions, court judgments, expert reports, bank evidence and witness materials from the foreign proceeding where relevant.

These records may contain evidence directly contradicting allegations made in Turkey.

Translation Must Be Accurate

Foreign criminal judgments and investigative documents may require proper translation for use before Turkish authorities.

A poor translation of technical criminal terminology can materially change the meaning of the foreign decision.

Finality of the Foreign Decision Should Be Proven

Where the defense relies on a foreign judgment, evidence showing whether the decision is final may be important.

Obtain the appropriate official confirmation where available.

A Foreign Case Dismissed for Procedural Reasons Requires Careful Analysis

Not every dismissal represents a factual determination that the accused did not commit the offense.

A case dismissed because of jurisdiction, limitation or another procedural reason may need to be distinguished from an acquittal following substantive examination.

What If Both Investigations Are Still Pending?

Parallel investigations can create significant practical difficulties. Statements given in one jurisdiction may be obtained and used in another.

The foreign national should therefore coordinate the defense strategy across both jurisdictions.

Do Not Give Contradictory Statements in Different Countries

A statement that appears harmless in one proceeding can create problems elsewhere.

Before providing detailed explanations, the suspect should understand the allegations and how the Turkish and foreign investigations overlap.

The Right to Remain Silent Must Be Considered Strategically

A foreign suspect should not feel compelled to provide an immediate substantive explanation simply because Turkish authorities ask about proceedings abroad.

The right to defense and applicable procedural rights should be evaluated before a statement is given.

Interpreter Rights Are Particularly Important

A foreign suspect who does not adequately understand Turkish should request interpretation during criminal proceedings.

The person should not sign a statement containing legal or factual assertions they do not fully understand.

International Evidence Sharing May Occur

Turkish authorities may seek evidence from foreign jurisdictions through applicable international cooperation mechanisms.

Likewise, evidence gathered in Turkey may become relevant to proceedings abroad.

Bank Records Can Connect the Cases

In fraud, money laundering and financial crime investigations, bank records often provide the clearest evidence showing whether the two proceedings concern identical transactions.

Obtain complete account records rather than isolated screenshots.

Digital Evidence Can Also Overlap

Phones, emails, cloud records, messaging applications and IP information may be examined in both countries.

The defense should determine whether the same digital material has already been forensically examined abroad.

Can a Foreign Judgment Be Submitted to the Turkish Prosecutor?

Yes, where relevant, the foreign decision and supporting documents can be brought to the attention of the Turkish authorities through the appropriate procedural submission.

The legal significance of the judgment should be explained rather than simply attaching it without analysis.

Can the Defense Request the Turkish Investigation Be Closed?

Where the circumstances and applicable law support such a result, the defense may argue that the Turkish investigation should not proceed or that the existing evidence does not justify prosecution.

Whether a non-prosecution decision is legally appropriate depends on the individual case.

What If an Indictment Has Already Been Filed?

The same international-jurisdiction and prior-proceeding issues can be raised before the criminal court.

The defense should establish the foreign procedural history with official evidence as early as possible.

Can Turkey Request Information About the Foreign Case?

International judicial cooperation mechanisms may allow relevant information or evidence to be obtained from foreign authorities.

The practical mechanism depends on the countries and nature of the proceedings.

Extradition Can Create Additional Complexity

A person facing proceedings in more than one jurisdiction may also become subject to an extradition request, international arrest mechanism or border alert.

The criminal defense should therefore be coordinated with any extradition or international police issues.

Interpol Records Should Be Checked Where Relevant

If the foreign proceeding has resulted in an international notice or diffusion, the person’s international travel risk may extend beyond the Turkish criminal case.

The existence and legal basis of such measures should be investigated separately.

Travel Restrictions in Turkey May Still Be Imposed

Even where proceedings exist abroad, Turkish authorities may consider domestic criminal-procedure measures if the legal requirements are satisfied.

The existence of a foreign case does not automatically prevent a Turkish travel restriction.

Detention Risk Must Be Evaluated Individually

Foreign nationality alone should not be treated as sufficient reason for detention. However, international residence, travel patterns and the circumstances of the investigation can become relevant to judicial assessments.

The defense should present concrete information concerning residence, employment, family, business and willingness to participate in proceedings where relevant.

What If the Foreign Case Was Based on the Same Witnesses?

Obtain the foreign witness statements if possible.

Material inconsistencies between statements given abroad and allegations later made in Turkey may be significant to credibility.

What If Evidence Was Found Unlawful Abroad?

The effect of a foreign ruling excluding evidence on Turkish proceedings requires separate legal analysis.

The defense should obtain the foreign ruling and explain precisely why the evidence was rejected.

A Foreign Acquittal Can Also Have Evidentiary Importance

Even where the jurisdictional rules do not automatically end the Turkish proceeding, a reasoned foreign acquittal may contain findings that materially undermine the prosecution case.

Expert reports, witness credibility findings and forensic conclusions may therefore be highly valuable.

Foreign Prosecutor Decisions Should Also Be Reviewed

A foreign prosecutor’s decision not to prosecute can contain important factual findings.

The reason for the decision should be examined carefully because not every non-prosecution decision has the same legal basis.

Do Not Assume Turkish Authorities Know About the Foreign Outcome

If a foreign case has ended favorably, provide the relevant official documents through the proper legal procedure.

Waiting for authorities to discover the decision independently can unnecessarily prolong the Turkish investigation.

Prepare a Cross-Border Case Matrix

For complex cases, the defense should prepare a comparative file showing the Turkish allegation, foreign allegation, dates, transactions, victims, evidence, legal characterization and procedural outcome.

This can make overlap immediately visible.

Corporate Investigations Require Additional Coordination

Where the suspect is a foreign company director or employee, parallel proceedings may also involve corporate internal investigations, regulatory inquiries and civil claims.

Statements made in one process should be evaluated for their possible effect on the others.

Confidentiality and Data Protection Must Be Considered

Transferring investigation documents between jurisdictions can raise confidentiality and data-protection issues.

Evidence should be obtained and transmitted through legally appropriate channels.

Can a Foreign Lawyer Represent the Person Directly in Turkey?

Turkish criminal proceedings require representation consistent with Turkish procedural and professional rules. Foreign counsel can nevertheless be important for obtaining documents and coordinating the parallel foreign proceeding.

Cooperation between counsel in both jurisdictions can substantially improve consistency.

Limitation Periods Should Be Examined Separately

Parallel proceedings do not eliminate the need to analyze limitation periods under Turkish law.

The dates of alleged conduct and procedural acts should therefore be recorded accurately.

Emergency Steps for a Foreigner Facing Parallel Proceedings

The foreign national should first obtain the Turkish investigation information available to the defense, determine the exact allegation and jurisdictional basis, obtain official records from the foreign case, compare the alleged conduct and transactions, document any foreign acquittal, conviction or non-prosecution decision, preserve evidence of punishment already served, avoid contradictory statements and coordinate Turkish and foreign criminal counsel before substantive procedural steps are taken.

Frequently Asked Questions

Can Turkey prosecute a foreigner who is already being investigated abroad?

Potentially. A pending foreign investigation does not automatically prevent Turkish authorities from investigating conduct falling within Turkish criminal jurisdiction.

What if the foreigner was already acquitted abroad?

The foreign acquittal can be highly significant, but its precise legal effect depends on the jurisdictional basis and circumstances of the Turkish case.

What if the foreigner was convicted abroad?

The foreign conviction, sentence and punishment already served should be documented and analyzed under the applicable Turkish criminal-jurisdiction rules.

Is the name of the offense required to be identical?

Not necessarily. The factual conduct underlying the two proceedings should be compared rather than relying only on the offense titles used by different legal systems.

Can a foreign judgment be used in Turkey?

A relevant foreign judgment can be submitted in the Turkish proceedings. Its legal and evidentiary consequences depend on the case.

Can evidence from the foreign investigation be used in Turkey?

Potentially, subject to applicable criminal-procedure and international-cooperation rules. The manner in which the evidence was obtained may also become relevant.

What if both cases are still pending?

The defense should coordinate both proceedings carefully because statements and evidence generated in one country may affect the other case.

Can Turkey impose a travel restriction even though there is already a foreign case?

Potentially, if the requirements for the relevant Turkish criminal-procedure measure are satisfied.

Should the foreigner tell Turkish police about the foreign case?

Relevant foreign proceedings should be addressed strategically with legal counsel and supported by official documents rather than through an improvised explanation during questioning.

What is the most important defense step?

Establish whether the Turkish and foreign proceedings genuinely concern the same conduct. Obtain the complete foreign case documents and compare the transactions, dates, victims, evidence and final outcome before determining the effect of the foreign proceeding under Turkish law.

Client-Focused Legal Support for Parallel Criminal Proceedings in Turkey and Abroad

Parallel criminal investigations can create serious risks involving multiple prosecutions, international evidence sharing, foreign judgments, detention, travel restrictions, extradition and inconsistent statements across jurisdictions. Fırat Fesih Kaya Law Office assists foreign nationals, foreign company executives and international clients facing criminal investigations or prosecutions in Turkey that overlap with proceedings abroad. Lawyer Fırat Fesih Kaya provides legal assistance in evaluating Turkish criminal jurisdiction, examining foreign judgments and investigation records, coordinating cross-border evidence, protecting procedural rights and developing defense strategies for parallel criminal 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, Office No:148, 06520 Balgat, Çankaya, Ankara, Turkey