Now Playing: 01-24-12 Marketplace Tech Report

The Supreme Court has issued a unanimous ruling in a case that has been watched closely by privacy advocates. United States v. Jones dealt with Washington, D.C., resident Antoine Jones, who was suspected of trafficking in drugs. Authorities attached a GPS device to Jones' car, ultimately tracing his movements to a suburban house used to stash drugs. The Supreme Court ruled on Monday that a search on someone's car is a search of their property and therefore a warrant should be required. The Court was unanimous in its ruling but was split 5-4 in exactly how the 4th Amendment applies in this situation.