Rodriguez v. United States: In a 6 to 3 vote the Supreme Court has determined that it's unconstitutional for police to detain you without reasonable suspicion while waiting for a drug sniffing dog to be brought to the scene.

Justice Ruth Bader Ginsburg wrote: "We hold that a police stop exceeding the time needed to handle the matter for which the stop was made violates the Constitution's shield against unreasonable seizures," the ruling states. "A seizure justified only by a police-observed traffic violation, therefore, 'becomes unlawful if it is prolonged beyond the time reasonably required to complete the mission' of issuing a ticket for the violation"