The decision to alert local and airport police raises a question of just how intimate the agency’s employees may get. On its website, the TSA says employees “use the back of the hands for pat-downs over sensitive areas of the body. In limited cases, additional screening involving a sensitive area pat-down with the front of the hand may be needed to determine that a threat does not exist.”
Now security screeners will use the front of their hands on a passenger in a private screening area if one of the prior screening methods indicates the presence of explosives, according to a “security notice” that the Airports Council International-North America (ACI-NA) sent its U.S. members following a March 1 conference call with TSA officials.
https://www.bloomberg.com/news/articles/2017-03-06/tsa-warns-local-police-about-its-new-airport-pat-downs