Illinois v. Caballes
Citation and Court
543 U.S. 405 (2005) — Supreme Court of the United States
Facts
Roy Caballes was stopped for speeding on a state highway. While one trooper was writing a warning ticket, another trooper walked a drug-detection dog around the outside of Caballes’s car. The dog alerted at the trunk; a search revealed marijuana. The entire stop lasted under ten minutes. Caballes argued that using the dog without reasonable suspicion transformed the stop into an unreasonable seizure.
Issue
Does the use of a drug-detection dog to sniff the exterior of a car during a lawful traffic stop, without any particularized suspicion of drug activity, violate the Fourth Amendment?
Holding
No; a dog sniff of the exterior of a car during a lawful traffic stop does not implicate the Fourth Amendment as long as the stop is not extended beyond its legitimate scope to allow for the sniff.
Rule / Doctrine
A dog sniff is not a “search” within the meaning of the Fourth Amendment because it only reveals the presence of contraband, in which there is no legitimate expectation of privacy. When the sniff is conducted during a lawful traffic stop that has not been prolonged specifically to enable the sniff, no additional Fourth Amendment justification is needed.
Significance
Illinois v. Caballes resolves whether dog sniffs of vehicles during traffic stops are searches, holding they are not so long as the stop is not unreasonably extended. It was later constrained by Rodriguez v. United States (2015), which held that even a brief extension of a stop to allow for a dog sniff is unconstitutional if not justified by reasonable suspicion.