Ordnance will not show up if it's in a body cavity. Furthermore, MMW is an unacceptable invasion of privacy.

The puffers are much more likely to detect explosives in shoes, undergarments, and molecular residue from explosives inserted into body cavities.

The TSA seldom passes up an opportunity to show how technologically inept they are. This pollyana answer on their website is just one more example of many reasons why the TSA should be permanently destroyed.