Many times it's just the way an individual officer inteperets the fules. Just recently I had my ResQMe tool confiscated by a member of the US Capitol Police (USCP). I had carried that on my keychain for five years and been in and out of Senate office buildings and the Capitol dozens of times without a second glance by the USCP folks. This one didn't like it. I didn't have time to search out a post office to mail it back to myself. I did have to do that a few weeks later when I forgot to take my knife out of my pocket. Luckily I had time to find a PO and mail it back.

I'm taking some maesure of revenge on the TSA as I just purchased at a TSA auction a lot of 10 pounds of mini SAKs. Looking for buyers...