To most people body scanners might be most familiar from airports. You walk in - lift your hands up - and get a body scan. Mostly those scans are heat signatures of your body, that means in areas where things press against your skin, it will be warmer and show up on the body scanner.
Millimeter Wave Scanners
Kisi's opinion: A great option for the modern office! (just joking) We've never been in an office where we had to be scanned, except for NASDAQ or NYSE!