Article L3354-1 of the French Public Health Code
When a crime, misdemeanour or traffic accident is detected, the officers or agents of the criminal investigation department must carry out the checks provided for in article L. 234-1 of the Highway Code andarticle L. 4274-14 of the Transport Code on the person of the alleged perpetrator in order to establish proof of the presence of alcohol in his body when it appears that the crime, misdemeanour or accident was…