Who needs to be TSA screened when you can just crash your plane killing all on board at will?
The reason I asked is that, going forward, there'll be some sort of rule requiring two crew members to be in the cockpit at all times. But that won't mean much if some nut pilot is carrying a three-inch blade.
Of course a that pilot can still do great damage will a ceramic coffee cup, or with his bare hands. So maybe it's a moot point.
And it says something about the sick state of the world that this is even an issue.