Concealed handgun detector tested by NYPD
Quote:
The Police Department’s effort to deploy a portable device that can detect concealed handguns on the street has moved to the testing of an actual model in New York City, Police Commissioner Raymond W. Kelly said Wednesday morning.The device detects natural radiation emitted by people, and any object obstructing the flow of the radiation registers on an image produced by the device, Mr. Kelly said in his annual speech about the state of the Police Department.
Police Start Testing Device to Spot Concealed Guns - NYTimes.com