DUI Stop
A DUI arrest is always preceded by a traffic stop, whether the police officer suspects drunk driving or has stopped a motorist for an unrelated reason, such as a burned-out taillight. While the Fourth Amendment protects citizens from unlawful search and seizure, refusing to cooperate with an officer typically is not in the best interests of a stopped motorist. Nevertheless, there are still ways to protect your rights when a police officer stops you for a DUI. FindLaw's "DUI Stop" subsection covers DUI defenses during and after a traffic stop, your rights under the Fourth Amendment, the legality of sobriety checkpoints and more.
From FindLaw