Idaho v. Dorff

(1) Whether a drug-detection dog physically intrudes upon a constitutionally protected area and therefore conducts an unreasonable search under the Fourth Amendment when it touches the exterior of a lawfully stopped car while sniffing for potential contraband; and (2) even if touching the exterior of a lawfully stopped car is a physical intrusion of a constitutionally protected area, whether the actions of a drug-detection dog, taken without direction, prompting, or facilitation by officers, are attributable to the government for purposes of the Fourth Amendment.