Which doctrine justifies warrantless vehicle searches because a vehicle's mobility makes warrants impractical?

• A. Plain View
• B. Carroll Doctrine
• C. Mapp Rule
• D. Stop and Frisk

Answer: (B)

The key idea is the automobile exception: because a vehicle can be moved quickly, getting a warrant before searching is often impractical. If police have probable cause to believe contraband or evidence is inside the car, they may conduct a warrantless search of the vehicle and its compartments that could reasonably contain the item. This principle comes from Carroll v. United States and explains why the mobility of a vehicle justifies bypassing a warrant.

Plain View involves evidence seen in plain sight during a lawful observation, not the grounds for a vehicle search. The Mapp Rule deals with the exclusion of unlawfully obtained evidence, not the justification for searching a vehicle without a warrant. Stop and Frisk concerns briefly detaining and searching a person based on reasonable suspicion, not vehicles.