Online magazine "The Intercept" obtained a Transportation Security Administration document that details signs and behaviors that TSA officers should be alert to in airline terminals across the U.S.

The TSA says behavior detection is "just one element" of its security protocol. Below are some of the details that Behavior Detection Officers are trained to examine as passengers are screened.

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"TSA's secret behavior checklist to spot terrorists"

TSA Spot Referral Report document (.PDF)