TSA airport checkpoint rules still secret
TSA refuses to publish the rules it imposes on us in our airports. The best you can hope for at this point is to digest all the tips, suggestions, press releases, and airport signage, try to comply with that of the above which is not contradictory, and throw yourself at the mercy of whatever TSA luggage inspector happens to search you.
If you are told that you're in violation of any of these secret rules you are required to follow, one of two things will happen: A) your freedom of movement will be restricted, or B) your property will be seized.