From the Politech mailing list, random traffic stops begin in Michigan:
Federal agents will begin randomly stopping traffic today, looking for illegal immigrants, terrorists and drug or weapon smugglers.
Cars will be stopped at unannounced, rotating checkpoints within Michigan, including metro Detroit. U.S. Border Patrol agents at the checkpoints will ask passengers their citizenship and will have leeway to ask a host of follow-up questions. […]
Whoah, remind me not to visit Michigan.