Normally, motorists have constitutional protections against unwarranted stops and searches while they're on the road. An officer can't randomly pull you over and start asking questions to fish around for evidence that you're driving while intoxicated on drugs or alcohol.
One exception to this general rule, however, is the sobriety checkpoint. Initiated by state law enforcement, sobriety checkpoints are usually put up around the holiday season (including New Years) to look for drivers who are under the influence of alcohol or drugs while they're behind the wheel.
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