The TSA has been tasked with finding “weapons, exposives, and incendiaries” (WEI) and preventing them from making their way onto airplanes. See 49 CFR § 1540.5 [1] (“Screening function means the inspection of individuals and property for weapons, explosives, and incendiaries”). To that extent, the TSA can lawfully conduct an “administrative search” for that purpose and that purpose only.
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