The days when stoned drivers were not bothered by traffic controls because they were only checked for alcohol are long gone. With quick tests, urine samples, and blood samples, police and traffic authorities can now prove any kind of drug use, and the sanctions that may be imposed if a positive result is found are usually more severe than those for drunk driving. In addition to basic information on the legal situation in Germany, Austria, and Switzerland regarding drugs and traffic safety, the book provides current examples of the practices of authorities and the judiciary, the applicable limits, the effects on consumers, and offers information and tips on how to behave in an emergency.