<ul><li>US government watchdog found Secret Service and ICE's HSI unit used cell-site simulators without obtaining appropriate search warrants.</li><li>Cell-site simulators or "stingrays" are controversial surveillance gear used to track cell phones' real-time location.</li><li>Federal agencies must obtain a search warrant before using a cell-site simulator, except in emergency circumstances.</li><li>Secret Service and ICE HSI did not always follow agency policies or federal law and accepted six recommendations to improve internal policies and procedures.</li></ul>

Watchdog reveals Secret Service and ICE used Stingray surveillance without warrants

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