I don't understand why he was arrested. Why didn't the TSA just confiscate the blade?
Easy -- "Let's make an example -- this guys famous, if we arrest him, it'll show everyone how serious we are".
Unfortunately, the heightened security + this guys celebrity = over-reaction.
Yes, I agree, it is highly noted and communicated HOWEVER do you even realize how easy it is to accidentally pack something?
When we were going to CUN
earlier this year, we got to the airport, and one of the bags we were checking (with a nail file in it) in was overweight. So, in a rush, we just grabbed stuff from that bag, and moved it into our carry-on.
It wasn't until we were PAST security that my friend noticed her nail file was in our carry on (was missed by security) so we quickly discarded it in a garbage.. Perfect example.