Sorry to say it Bullstrode but it's partly because of the IGNORANT that things get worse and not better in the security scene. Your tuna case is a perfect example. It's all been pointed out to you here but all you can think about is how much water might or might not be in the can and whether or not it could be used as a weapon. If you really work in the airline industry then surely you're not that dim. Hang on.... are you cabin crew???