Under what condition can an officer search a vehicle during a DUI stop?

An officer can search a vehicle during a DUI stop under specific conditions, primarily when they have probable cause to believe there is evidence of a crime within the vehicle or if the driver provides consent for the search. Probable cause might arise from observations of impaired driving, the odor of alcohol or drugs, or any other indication that illegal items are present. By having probable cause, officers are legally justified to conduct a search without requiring a warrant. Consent allows an officer to conduct a search based on the driver's agreement, which does not necessitate probable cause or a warrant.

This understanding is foundational to upholding the Fourth Amendment rights against unreasonable searches and seizures while also allowing law enforcement to effectively investigate possible criminal activity.