Catherine Herridge reported on "Happening Now" about a disturbing trend of law enforcement agencies in Florida utilizing sophisticated, invasive tracking devices.

New documents obtained through court action by the ACLU, expose that the use of "controversial surveillance technology by local police departments for routine crimes is far more widespread than previously reported," Herridge said. 

"Some local jurisdictions are now accused of concealing their use of 'stingray' technology," she explained. "This is technology that acts like a cell site simulator and is considered an invasive surveillance device. It mimics a cell phone tower transmitting a signal that fools your phone into transmitting location and other identifying information."

"According to one document, the ACLU says the Florida Department of Law Enforcement used cell phone simulators more than 1,800 times," Herridge reported.

She added that the Tallahassee Police Department lists more than 250 investigations in which stingrays were used over a seven year period.

Herridge noted that this strongly suggests the technology wasn't limited to federal investigations, even though the equipment was purchased with a homeland security mission in mind. She said that this device is being used in at least 20 states.

Watch the video above to hear more about this controversial surveillance technology.