I think we should point out that it is infact ILLEGAL to be in possession of an offensive weapon in public. So what were the knives doing in a carry on bag????? Obviously the questions at check in are not working. "did you pack the bags yourself?" If you did, then you would remember that you had a knife in there. " have you left them unattended at any time?" " is there anything sharp in there". How can you pack a bag and not know what you've put in it??? Especially when there's been so much publicity about it. What were the knives doing in the bag in the first place???? It isn't that easy to forget what you have packed in your bags surely?