explosives in his sneakers. on christmas day last year, umar farouk abdulmutallab wore underwear with p.e.t.n. neither device exploded. t.s.a. does not erelease statistks found at airports for intelligence reasons but these cases were well-known. in he vent of the scanner and pat-down screeners former screener said they're easy to conceal. >> people can very easily adaptable. it can be rolled out, paper thin. >> head of the t.s.a. says the new procedures are driven by the severe threat picture. >> al-qaeda arabian peninsula, and al-qaeda focussed on the aviation plot. whether it's the passenger aircraft or cargo aircraft, that's the concern. >> the "associated press" reports the cabinet secretary congressional leaders are exempt from the screening procedures when they fly commercially with the government security detail. there was no response from