The machines are unable to detect explosives, according to a Homeland Security Department report on aviation screening recently obtained by The Associated Press.
The Transportation Security Administration ordered the shoe-scanning requirement as it fine-tunes new security procedures.
Those procedures were put in place after British police last week broke up a terrorist plot to assemble and detonate bombs aboard as many as 10 airliners going from Britain to the U.S, the AP reports.
Among the new procedures are a ban on liquids and gels in airline passenger cabins, more hand searches of carry-on luggage, and random double screening of passengers at boarding gates.
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