I was traveling on the very day that the U.S. promulgated the "no liquids" rule (2006?). I knew about it in time to pack such liquids as I had in a bag that I could check, but I held on to a prescription nasal spray. The TSA told me that they would have allowed it if there had been a prescription label, but there wasn't -- pharmacy had put the label on the box it came in, not on the bottle.