I actually inadvertently brought weed into the US right after 9/11. I went to Holland Sept. 8th and when 9/11 happened I was stuck there for several weeks. I smoked a ton and was really burned out and anxious about getting home and forgot to check my coat pocket. To make a long story short I packed the coat into my suitcase because it'd be uncomfortable on the plane and flew home. It wasn't until later on that I discovered two half smoked prerolled pure widow joints (from Abraxas.. my fav shop!) and one joint I rolled and forgot about of silver haze. Needless to say I was relieved they didn't find it yet insanely happy about the nice surprise. Anyhow.. you could always try this route but I was probably just lucky.
Sort of off topic but on the same occasion my passport got bent up and the security seal was broken on the picture. Upon approaching customs at Schinpol (sp?) airport in Holland the guy looked at my passport, looked at me, said something on his radio and suddenly I was asked by two guards to follow them. I eventually was led into a small room with no signs or anyone in it and told to "wait here". I had no idea what it was about until they finally came back and said "Your passport is damaged. We had to check to make sure everything was legit. You may go now." If you're caught you'll probably face a similar fate except for the part where they let you go.