What is the 'plain smell' doctrine and its relevance?

• A. A smell alone can never provide probable cause.
• B. Plain smell doctrine is an exception to the warrant requirement.
• C. Odors indicating contraband can create probable cause when officers are lawfully present.
• D. Only visual cues can establish probable cause.

Answer: (C)

Plain smell doctrine means that if a police officer is lawfully present in a place, the odor of contraband can provide probable cause to search or seize. Odors are a tangible, perceivable cue that, when strongly linked to illegal activity, helps a reasonable officer conclude that contraband is present. The key element is being lawfully present; the scent alone can be enough to justify action, just as with the plain view doctrine, but it relies on discernible smells rather than visual evidence. This doesn’t make every smell a license to search—ordinary, non-contraband smells won’t support probable cause—but the odor of illegal drugs or other contraband, detected lawfully, can establish probable cause to act.