https://www.findlaw.com/dui/arrests/dui-checkpoint-laws-by-state.html https://www.findlaw.com/dui/arrests/dui-checkpoint-laws-by-s... Varies from state to stat

https://www.findlaw.com/dui/arrests/dui-checkpoint-laws-by-state.html https://www.findlaw.com/dui/arrests/dui-checkpoint-laws-by-s... Varies from state to state - in some states they are illegal under state law or state constitutions, etc. Looks like they're illegal in MI.