Monkeywrenching airport security

[keyser-soze]

Walk into an airport in baggy pants with powdered expolosives in a leg bag which can 
slowly be dispersed as you walk (perhaps controlled by some sort of string control 
like POWs scattered excavated soil in "The Great Escape").  After walking around in 
the lobby it should soon be tracked to the security checkpoints and interfere with any 
current swab or automated detection methods.