Legal Aspects of International Criminal Law in Thailand

Herrera & Partners – Extradition & INTERPOL group
Bangkok, Thailand

Key Takeaways

Extradition, mutual legal assistance and INTERPOL cooperation in Thailand each run under a different law and a different procedure.
The Extradition Act B.E. 2551 governs surrender; the Act on Mutual Assistance in Criminal Matters B.E. 2535 governs evidence sharing.
The Attorney General is Thailand’s Central Authority for both extradition requests and mutual legal assistance requests.
Herrera & Partners (H&P) assists private clients in extradition, mutual legal assistance and INTERPOL matters in Thailand.

International criminal law in Thailand covers a broad range of mechanisms designed to address crimes that cross national borders. In the era of globalization, the H&P law firm have assisted a wide number of private clients in extradition processes in Thailand. These international law cases include extradition, mutual legal assistance, and cooperation with international policing organizations such as INTERPOL.

As transnational crime becomes increasingly sophisticated and interconnected, Thailand relies on a combination of domestic legislation, bilateral treaties, Mutual Legal Assistance Treaties (MLATs), and international cooperation frameworks to respond effectively to such offenses.

Extradition under the Extradition Act B.E. 2551

Extradition in Thailand is governed primarily by the Extradition Act B.E. 2551 (2008), as well as bilateral treaties with specific countries. Through this legal pathway, Thailand can surrender individuals to foreign states for prosecution or to serve sentences imposed abroad. Extradition requests are evaluated carefully, with Thai authorities considering factors such as dual criminality, the nature of the alleged offense, human rights protections, and whether the request falls within the scope of existing treaties. Procedural safeguards and judicial oversight ensure that extradition is not automatic and that the rights of the individual are respected.

Mutual Legal Assistance Treaties (MLATs)

Mutual Legal Assistance Treaties (MLATs) complement the extradition framework by enabling cooperation in:

Collection and exchange of evidence
Conducting witness interviews
Serving legal documents
Tracing assets

MLATs allow Thai authorities to access information and evidence that would otherwise be difficult or impossible to obtain. For instance, in cases involving cybercrime, money laundering, or organized criminal networks operating across multiple jurisdictions, MLATs provide a legal mechanism to coordinate investigations, share evidence, and support prosecutions effectively while adhering to domestic and international legal standards.

INTERPOL notices in Thailand

INTERPOL notices form another important aspect of Thailand’s international criminal law framework. These notices, including the well-known Red Notice, function as alerts to assist in locating individuals wanted for prosecution or sentencing abroad.

While these notices do not carry the force of law for arrest or extradition, they facilitate cooperation among law enforcement agencies and can inform decisions regarding domestic arrest warrants or other legal actions.

Thai authorities must assess each notice carefully to ensure compliance with domestic law and respect for human rights, particularly in cases where the requesting country may impose the death penalty, torture, or other forms of inhumane treatment.

Mechanism	Purpose	Legal effect
Extradition	Surrender of a person to face prosecution or serve a sentence abroad	Requires a treaty or reciprocity, dual criminality, and judicial oversight
Mutual Legal Assistance (MLATs)	Collection and exchange of evidence, witness interviews, tracing assets	Coordinated investigations under domestic and international legal standards
INTERPOL notices	Alerts to locate individuals wanted for prosecution or sentencing	Do not carry the force of law for arrest or extradition

Key legal principles: dual criminality, political offences and human rights

Underlying these mechanisms are key legal principles that guide Thailand’s international cooperation:

Dual criminality, ensuring that only acts recognized as crimes under both Thai law and the requesting state’s law can justify extradition or legal assistance
Exclusion of political and military offenses, to prevent persecution disguised as prosecution
Human rights protections, including safeguards against torture or inhumane treatment, central to the evaluation process

Central authorities, including the Office of the Attorney General, maintain discretionary powers to approve or deny requests based on public interest, fairness, and legal compliance.

Practical challenges in cross-border cases

Despite these frameworks, challenges remain in implementing international criminal law. Differences in legal systems, procedural standards, and definitions of offenses across jurisdictions can complicate extradition and mutual assistance processes.

Delays in collecting and transferring evidence, translation issues, and varying standards for admissibility of evidence can affect the timeliness and effectiveness of investigations.

There is always a potential risk of misuse of international cooperation for political purposes, which shows the need for careful legal oversight and adherence to procedural safeguards.

Balancing cooperation and individual rights

Thailand’s approach seeks to balance the effectiveness of cross-border cooperation with the protection of due process and fundamental rights. By relying on established legal safeguards and combining extradition, MLATs, and INTERPOL cooperation, Thailand can respond to transnational crimes efficiently while ensuring fairness and legality.

This combined legal framework builds Thailand’s capacity to participate in international criminal justice, strengthens regional security, and protects the rights of individuals involved in cross-border legal matters.

Extradition, mutual legal assistance, and cooperation with INTERPOL are the three tools Thai authorities use to work with foreign counterparts, each bound by dual criminality, the exclusion of political offences, and human rights protections.

If you are facing an international criminal law case in Thailand, please contact our law firm in Thailand at contact@thailandextradition.com

Frequently asked questions

Which laws govern international criminal cases in Thailand?

The Extradition Act B.E. 2551 (2008) governs surrender of persons. The Act on Mutual Assistance in Criminal Matters B.E. 2535 (1992) governs evidence and investigative assistance. Bilateral treaties prevail where they differ.

Who handles foreign requests for extradition or legal assistance in Thailand?

The Attorney General, or a person designated by him, is the Central Authority under both Acts. Requests from states without a treaty arrive through diplomatic channels via the Ministry of Foreign Affairs.

Can Thailand cooperate with a country that has no treaty?

Yes. Both Acts allow cooperation on reciprocity: the requesting state commits to assist Thailand in similar cases, and the conduct must be an offence under Thai law.

Does an INTERPOL Red Notice mean I will be arrested in Thailand?

Not automatically. INTERPOL states a Red Notice is not an international arrest warrant; member countries apply their own laws when deciding whether to arrest. In Thailand, a domestic warrant is required.

When can Thai authorities refuse a foreign request?

For political or military offences, threats to national sovereignty or security, and human rights risks such as torture or the death penalty. Sensitive mutual assistance requests go to an inter-ministry board for opinion.