Would that be cavity check and blood type? If you don't think what the FBI may have on file isn't comprehensive you'd likely be wrong. In recent weeks a Agent quit the National Security Agency over data collection on US citizens and the Justice Department was lightly scolded over authorizing dossiers on any citizen with a 5 year life span to the documentation even if no criminal wrong doing was involved.
http://www.ask.com/wiki/Trailblazer_Project
http://www.ask.com/wiki/NSA_warrantl...ce_controversy
http://www.freerepublic.com/focus/f-news/2965947/posts
http://www.wired.com/threatlevel/201...n-us-citizens/
Some of this is legislated, under the Patriot Act and some is well maybe questionable... But without a tin hat my point is there is plenty of information gathered, have no doubt they know who you are and what your about with the click of a few keys..