The criminal process in Thailand
If you or someone you know is accused of a crime in Thailand, the process below is the map. Get a licensed Thai criminal lawyer involved at the earliest possible moment — and contact your embassy if you are a foreigner in custody.
From arrest to court
- Arrest / accusation. Police can arrest with a warrant, or without one in limited situations (in-the-act offences). You have the right to be informed of the charge, to contact a lawyer and a relative, and to an interpreter.
- Police investigation. The inquiry officer takes statements and evidence. Do not sign documents you cannot read — ask for a translation.
- Detention and bail. Police detention is short; longer detention needs court remand extensions. Bail is routinely granted for most offences against security (cash, bank guarantee, or property deeds), though it can be refused for serious charges or flight risk.
- Prosecutor. The public prosecutor decides whether to indict. In Thailand, private criminal prosecutions are also possible — an alleged victim can file a criminal case directly with the court, which then holds a preliminary hearing.
- Trial. Career judges, no jury, proceedings in Thai. Guilty pleas typically earn substantial sentence reductions — commonly up to half.
- Appeal. Both conviction and sentence can be appealed within short deadlines, and then to the Supreme Court in limited circumstances.
Laws that surprise foreigners
- Criminal defamation. Defaming someone — including online reviews and social posts — can bring criminal charges, not just a lawsuit. Truth is a defence only in limited public-interest circumstances.
- Computer Crime Act. Posting “false data” online carries criminal exposure and is frequently charged alongside defamation.
- Lèse-majesté (Section 112). Insulting the monarchy is a grave offence with long sentences. There is no safe way to test the line — do not.
- Drugs. Penalties remain severe, especially for trafficking quantities. Cannabis rules have shifted repeatedly since 2022 — assume regulation is in flux and check the current status before touching anything.
- Gambling, e-cigarettes, some drones/imports — all more restricted than newcomers expect.
- Online fraud and scams. Running a scam — or, increasingly, unwittingly letting a bank account be used to receive scam proceeds — can trigger criminal exposure alongside the Computer Crime Act; see consumer protection.
- Careless or reckless driving causing injury or death. A traffic incident can become a criminal case, not just an insurance claim; see traffic & driving law.
Victims of crime
A crime victim is not just a witness. Victims can join as a civil party within the criminal case itself to claim compensation, apply separately for state compensation through the Justice Fund for certain violent offences, or pursue a standalone civil claim — see personal injury and legal aid for the routes available.
Juveniles
Offenders under 18 are handled by the Juvenile and Family Court rather than the ordinary criminal process, with an emphasis on welfare, parental involvement and, where appropriate, diversion away from a formal criminal record. Procedures around questioning, detention and hearings are correspondingly more protective than for adult defendants.
Compoundable offences
Not every criminal case has to end in a trial. A category of offences — generally private-interest matters such as certain fraud, some assault and property offences — are compoundable: the injured party can agree to settle and withdraw the complaint, ending the case. This is different from a purely civil settlement of damages; it is a recognised route built into the Criminal Procedure Code, and it explains why many disputes that start as a police report end in a negotiated apology and payment rather than a verdict. Not every offence qualifies — serious and public-interest crimes (violence causing serious harm, most drug offences, offences against the state) cannot be compounded regardless of what the parties want.
Search and arrest in more detail
Police generally need a warrant to search a private residence, though urgent circumstances — evidence about to be destroyed, a suspect fleeing — allow warrantless action in limited situations. An arrest warrant likewise generally requires advance court approval, except for in-the-act offences or a suspect caught fleeing the scene. If you believe a search or arrest was procedurally improper, that is a point for your lawyer to raise: evidence obtained unlawfully can, in principle, be challenged, though the practical outcome depends heavily on the facts.