US Supreme Court Rules Dog Sniff that Extends Traffic Stop Violates Constitution

RODRIGUEZ v. UNITED STATES Syllabus

1. Absent reasonable suspicion, police extension of a traffic stop in order to conduct a dog sniff violates the Constitution’s shield against unreasonable seizures. A routine traffic stop is more like a brief stop under Terry v. Ohio, 392 U. S. 1, than an arrest, see, e.g., Arizona v. Johnson, 555 U. S. 323, 330. Its tolerable duration is determined by the seizure’s “mission,” which is to address the traffic violation that warranted the stop, Illinois v. Caballes, 543 U. S. 405, 407 and attend to related safety concerns. Authority for the seizure ends when tasks tied to the traffic infraction are—or reasonably should have been— completed. The Fourth Amendment may tolerate certain unrelated investigations that do not lengthen the roadside detention, Johnson, 555 U. S., at 327–328 (questioning); Caballes, 543 U. S., at 406, 408 (dog sniff), but a traffic stop “become[s] unlawful if it is prolonged beyond the time reasonably required to complete th[e] mission” of issuing a warning ticket, id., at 407. Beyond determining whether to issue a traffic ticket, an officer’s mission during a traffic stop typically includes checking the driver’s license, determining whether there are outstanding warrants against the driver, and inspecting the automobile’s registration and proof of insurance. These checks serve the same objective as enforcement of the traffic code: ensuring that vehicles on the road are operated safely and responsibly. See Delaware v. Prouse, 440 U. S. 648, 658–659. Lacking the same close connection to roadway safety as the ordinary inquiries, a dog sniff is not fairly characterized as part of the officer’s traffic mission. In concluding that the de minimis intrusion here could be offset by the Government’s interest in stopping the flow of illegal drugs, the Eighth Circuit relied on Pennsylvania v. Mimms, 434 U. S. 106. The Court reasoned in Mimms that the government’s “legitimate and weighty” interest in officer safety outweighed the “de minimis” additional intrusion of requiring a driver, lawfully stopped, to exit a vehicle, id., at 110–111. The officer-safety interest recognized in Mimms, however, stemmed from the danger to the officer associated with the traffic stop itself. On-scene investigation into other crimes, in contrast, detours from the officer’s traffic-control mission and therefore gains no support from Mimms. The Government’s argument that an officer who completes all traffic-related tasks expeditiously should earn extra time to pursue an unrelated criminal investigation is unpersuasive, for a traffic stop “prolonged beyond” the time in fact needed for the officer to complete his traffic-based inquiries is “unlawful,” Caballes, 543 U. S., at 407. The critical question is not whether the dog sniff occurs before or after the officer issues a ticket, but whether conducting the sniff adds time to the stop. Pp. 5–8.

2. The determination adopted by the District Court that detention for the dog sniff was not independently supported by individualized suspicion was not reviewed by the Eighth Circuit. That question therefore remains open for consideration on remand. P. 9. 741 F. 3d 905, vacated and remanded.

GINSBURG, J., delivered the opinion of the Court, in which ROBERTS, C. J., and SCALIA, BREYER, SOTOMAYOR, and KAGAN, JJ., joined. KENNEDY, J., filed a dissenting opinion. THOMAS, J., filed a dissenting opinion, in which ALITO, J., joined, and in which KENNEDY, J., joined as to all but Part III. ALITO, J., filed a dissenting opinion.