The Department of Homeland Security is testing a type of body scanner that seeks out invisible clues that a person might be harbouring criminal intent, such as raised body temperature, pulse and breathing rate.
The system, called MALINTENT, uses a raft of "non-invasive" sensors and imagers to detect such factors remotely - subjects are not hooked up to anything. It also evaluates a person's facial expression to help to gauge whether they could be planning to commit an attack or crime.
The technology, developed by the Human Factors division of Homeland Security's directorate for Science and Technology, would be used at border checkpoints, airports and special events that require security screening.
Unlike current technology which aims to detect devices such as guns or explosives, it focuses on the person who could pose the threat.
The technology, dubbed Future Attribute Screening Technology, or FAST, deploys a range of "innovative physiological and behavioural technologies" to pick up "indications of malintent or the intent or desire to cause harm", according to the DHS.
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