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The individual was ordered to undergo a second search after initially passing through a metal detector at Terminal D, according to an official at LaGuardia.
The man removed his shoes, which set off an alarm that is meant to detect explosives, according to Transportation Security Administration spokeswoman Yolanda Clark. At that point, around 3 p.m., the man put his shoes back on and left the area. The terminal was evacuated at around 3:45 p.m., Clark said.
but such machines also can give an alert on benign substances.