The NY Police Department announced the adoption of portable scanning technology allowing police officers to detect whether someone has a concealed weapon from a distance. According to CNET, the scanner is small enough to fit in a police van. The device reads terahertz radiation–energy emitted by both humans and inanimate objects. NYPD Commissioner Raymond Kelly told the New York Daily News, “If something is obstructing the flow of that radiation, for example a weapon, the device will highlight that object.” The NYPD wants to start testing it in high-crime areas in the near future. The technology is not without controversy. Civil liberties groups maintain that “searches” are conducted without cause and false positives can also lead to unjustified stops.