A federal court in Arizona has denied a motion to suppress evidence gathered by "StingRay" surveillance technology. The court in United States v. Rigmaiden held that investigators did not violate the Fourth Amendment. The court also held that the government's use of a cell site simulator or StingRay device was supported by a "mobile tracking device" warrant. EPIC recently argued that users have a reasonable expectation of privacy in the location of their mobile devices, and has also received hundreds of pages of documents related to the FBI's use of StingRay technology. For more information, see EPIC v. FBI: StingRay and EPIC: State v. Earls.