The US Supreme Court ruled that affixing a GPS tracking device to a vehicle constitutes a search under the constitution. The decision throws out the drug-related conviction of nightclub owner Antoine Jones. The GPS locator was installed the day after the warrant expired and while the vehicle was outside of the department’s jurisdiction, and police tracked Jones for nearly a month after installation before arresting him. Privacy advocates argue that GPS tracking is a powerful technology that allows for persistent surveillance and thus needs to be used with caution and oversight.
Source: https://thehackernews.com/2013/03/feds-do-not-need-court-warrants-to.html