A random selection of travellers getting ready to board airplanes in Washington, New York's Kennedy, Los Angeles and other key hubs will be shut in the glass booths while a three-dimensional image is made of their body beneath their clothes.
The booths close around the passenger and emit "millimeter waves" that go through cloth to identify metal, plastics, ceramics, chemical materials and explosives, according to the TSA.
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While it allows the security screeners -- looking at the images in a separate room -- to clearly see the passenger's sexual organs as well as other details of their bodies, the passenger's face is blurred, TSA said in a statement on its website.
The scan only takes seconds and is to replace the physical pat-downs of people that are currently widespread in airports.
TSA began introducing the body scanners in airports in April, first in the Phoenix, Arizona terminal.
The installation is picking up this month, with machines in place or planned for airports in Washi