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"Portable scanning device" on the Tube ?

The Times reports that

"A small number of plainclothes anti-terror police will be deployed on the Tube. They may be equipped with a portable scanning device that can detect potential suicide bombers"

Really ? Exactly how is this supposed to work ?

Is this a Passive Millimetre Wave Radar "see under your clothes" Camera ?

Or are is The Times getting confused with reports about radiation and chemical weapons sensors or biowarfare agent sampling kits ?