The series of European Standards EN 50436 specifies test methods and essential performance requirements for alcohol interlocks and gives guidance for decision makers, purchasers and users. The content and requirements of the European Standard EN 50436-1 "Alcohol interlocks – Test methods and performance requirements, Part 1: Instruments for drink-driving-offender programs" are based on the experience and necessities of drink driving offender programmes in different countries over several decades.