The new technology utilizes terahertz waves, which sit on the electromagnetic spectrum between microwaves and infrared. They’ve been used to do everything from detect cancer to create 3D images of teeth for dentists.
The reason that the NYPD is so interested terahertz waves is that they pass through nonconductive materials like clothes, but can’t penetrate metal — like, say, the steel in a semi-automatic pistol. That means if you scan someone, you can look for spots where a person’s natural terahertz radiation is blocked, most likely by a metal object.
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