Calif. privacy groups oppose cellphone surveillance device
The point of warrants is to ensure that searches are confined only to those who are the focus of an investigation, added Hanni Fakhoury, a staff attorney for the Electronic Frontier Foundation. They're also designed to make certain nothing is left to the discretion of individual officers, something framers of the Constitution had in mind after British soldiers prior to the Revolutionary War conducted door-to-door searches at will.
"If you read the warrant affidavit, it has absolutely zero mention at all of IMSI catchers and stingrays or fake cellphone towers or any explanation of the technology," Fakhoury said. "Courts are busy, judges are busy; they rely on the government in good faith to explain what they're doing."