Yes. In Michigan Department of State Police v. Sitz, the United States Supreme Court held that sobriety checkpoints do not violate the Fourth Amendment of the Constitution because there is a “substantial governmental interest” in stopping drunk driving. If you find yourself at a sobriety checkpoint after you’ve been to “happy hour,” the best course of conduct is to be very polite to the police and do not engage in any conduct that will arouse suspicion. Being rude to the police or acting in a manner that will make you appear odd can likely get you pulled over and subjected to a sobriety test.