The TSA failed to follow the government rules about allowing public comment before adding the full body scanners. The orginization EPIC sued the TSA because of the lack of public comment. They won, and the TSA still has not held the public hearings that are required by law and the court.
Recently there was a petition on the WhiteHouse.gov website that requested the Executive force the TSA to abide by the laws and the court order. This petition was removed before it's time.
There is an effort to re-submit the petition, and track the signatures and results. To follow this movement, please go to: http://10-1157.tumblr.com/