Possibly a crew check in area?
The best suggestion here so far. The problem is that so many crews away from their home bases have to take their 'nightstop' bags with them through security. (And there is no consistency around the world with the way these are viewed by security.) Some facts would be interesting in this case, was this just a case of a nightstop bag not meeting the full security requirements? And if so, why were the Met brought in without another satisfactory solution being found? I suspect we'll never know because this case will probably never get to an open court but will just be 'quietly' dropped. Of course, without any apology from the authorities who drop the case to all those passengers who were inconvenienced.