Thailand Legalizes Sobriety Tests for Alcohol Buyers

Thailand has officially introduced standardized sobriety tests that allow shop and bar staff to assess whether customers are intoxicated before selling alcohol.

Although selling alcohol to intoxicated individuals has long been prohibited in the country, only recent amendments to the Alcohol Control Act have clearly defined how such checks should be carried out in practice.

The Ministry of Public Health published the official guidelines on March 28, and they have already come into force. The document outlines clear criteria for identifying intoxication based on both physical and behavioral indicators.

A person may be considered intoxicated if they show impaired coordination or cognitive function and pose a potential risk to themselves or others.

The guidelines list several visible indicators, including:

• smell of alcohol

• red or irritated eyes

• unsteady movement, tremors, poor coordination

• slurred or impaired speech

• mood swings, aggressive or antisocial behavior

• reduced attention and awareness

In addition to observational signs, the regulation introduces three simple physical tests that can be used by authorized personnel, including retail and hospitality staff:

1. Finger-to-nose test

   The individual must touch the tip of their nose with their finger while keeping their eyes closed. Missing the target by more than one centimetre or visible tremors is considered a failure.

   
   

2. Straight-line walk test

   The person must walk 10 steps in a straight line, placing heel to toe, turn around, and walk back the same way. Failing indicators include losing balance, stepping off the line, using arms for support, or stopping prematurely.

   
   

3. One-leg stand test

   The individual must stand on one leg for 30 seconds, with the other leg raised about 15 centimetres above the ground. Losing balance, instability, or stopping early is considered a failure.

The regulation does not specify exactly when these tests must be applied. Instead, it provides a standardized framework to help businesses comply with existing laws that prohibit alcohol sales to intoxicated individuals.

The move comes amid stricter enforcement measures targeting vendors, who can face penalties if they serve alcohol to visibly intoxicated customers.