Samenvatting
This paper examines the effects of introducing sobriety checkpoints on the roads of North Carolina. Known as the `Boose it and lose it' programme, the setting up of the checkpoints was accompanied by widespread publicity. Random surveys were carried out among drivers entering the checkpoint sites. Prior to the checkpoint programme 1.96% of drivers were found to have blood alcohol contents above the legal limit. Following the introduction of the programme this dropped to 0.9%.