In this case, a warrant had been granted, but installation of the GPS device was authorized by a judge only within 10 days and only in the District of Columbia.
Agents waited until the 11th day to secretly place it on the vehicle, and they did so in neighboring Maryland. Jones was then monitored for 28 days as he drove around the area.
He was eventually tracked to a house where law enforcement officers discovered nearly 100 kilograms of the illegal narcotic, along with about $850,000 in cash. Jones was sentenced to life in prison.
The court was being asked to decide whether such covert surveillance violated the Fourth Amendment and whether in this case it should be considered a "search," a "seizure" or both.
Image courtesy of http://www.kmbllp.com/ blog.