Breath Alcohol Ignition Interlock Devices (BAIID's) were first introduced commercially in the USA in 1986 and over the few years have become recognised as a promising new traffic safety initiative in dealing with offenders of drinking driving laws. In early 1990, two insurance companies in Sweden became aware of the development of this initiative and began to investigate its potential for use in Sweden. The paper describes how an interlock program came to be in Sweden. It also presents some basic facts about the legislation and how an offender qualifies for a scheme. Since the program has been in use only for a year no conclusions is drawn. However, all indications seem to point towards positive results.