The United States v. Antoine Jones case in 2011 revolved around the issue of law enforcement's use of GPS tracking without a warrant and its implications on Fourth Amendment rights, which protect against unreasonable searches and seizures. The police had attached a GPS device to Jones' vehicle without valid warrant, leading to his conviction for drug trafficking based on the gathered information. However, the U.S Supreme Court unanimously ruled that this action constituted a 'search' under the Fourth Amendment. Therefore, attaching a GPS device to track an individual's movements requires obtaining a search warrant first due to privacy concerns. This landmark decision significantly impacted law enforcement procedures regarding surveillance technology usage.

In the dissenting opinion for United States v. Antoine Jones, Justice Alito argued that long-term GPS monitoring infringes on an individual's expectation of privacy and thus constitutes a search under the Fourth Amendment. However, he disagreed with the majority's trespass-based reasoning. Instead, he proposed a reasonable expectation of privacy test to determine whether law enforcement actions constitute a search. He suggested that short-term monitoring is generally accepted by society and does not violate expectations of privacy but prolonged surveillance does because it allows police to observe patterns in someone’s movements over time which could reveal intimate details about their life – something not possible through visual observation alone.