Other critics said publicly disclosing reading material could feel like an invasion of privacy to some travelers.
"A person who is reading a book entitled 'Overcoming Sexual Abuse' or 'Overcoming Sexual Dysfunction' is not likely to want to plop that volume down on the conveyor belt for all to see," said notes privacy expert Jay Stanley in an analysis of the TSA's previous plan.
But the TSA has asserted the the book search, which has been terminated at test airports will not expand across the country as previously planned.
Passengers do not need to remove books from carry-on bags before sending luggage through X-ray machines.
"We're always testing procedures to help stay ahead of our adversaries. We were testing the removal of books at two airport locations and the testing ran its course," the TSA said in a news release. "We're no longer testing and have no intentions of instituting those procedures."
In the release, the TSA said it implemented the book screening test because “adversaries seem to know every trick in the book when it comes to concealing dangerous items, and books have been used in the past to conceal prohibited items.”
"We weren't judging your books by their covers, just making sure nothing dangerous was inside," TSA said.