so the police officer stops you at a DUI checkpoint and he wants to search your car what do you do always refuse to consent to searches a police officer needs either consent or probable cause to search your car if he has probable cause then he doesn't need a search warrant but if he doesn't have probable cause he either needs a search warrant or your consent and we never consent to searches you're at a checkpoint for DUI investigations give them your license and your registration if they ask you for it otherwise don't answer any questions and don't consent to any searches