A scanner mounted on a tripod at a busy part of an airport will point at people 30 feet away.

The machine reads the energy emitted from a human body. It looks for "cold" spots where dense objects such as explosives block energy.

Machines were recently tested at Minneapolis-St. Paul International Airport and Denver International Airport during conventions.

In the test at Denver, the scanner led to two people being questioned by police. Neither was arrested. Two people also were questioned in Minneapolis and weren't arrested.




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