I am an old guy who has not flown anywhere since before COVID. Recently I went to Bangkok from Chiang Mai for a week. Check-in security scanning at CNX was normal, or at least as I expected it to be. Bag scanned, no problem, went right through. Coming back at BKK it was different. They scanned my bag, then opened and searched it, and then may me take out and throw away a can of shaving cream and a tube of toothpaste from the travel kit. "Too big" they said. They were "normal" sized. I thought that nonsense was over years ago, at least in Thailand. Is that (post-9/11) rule still the case in Thailand? Then why the inconsistency between BKK and CNX?