Abstract: The invention refers to a solution of the problem that during a longer time prevail upon alcoholics or other drug abusers to refrain from alcohol or other drug. Methods and devices to prevent that a person utilises a drug comprises that a punishing unit is fixed to the person in such a way that the punishing unit not without difficulty can be removed, that a sensing or test unit which according to predetermined criteria detects the existence of drug use by the person is provided outside the body of a person, and that the sensing or test unit is arranged to communicate with the punishing unit and control it. The punishing unit can comprise means for brining out negative reactions in the person, for example in the form of an electric stimulator.