Surely any category that isn't searched is a security weakness - the terrorist only has to convincingly personate a member of that category to get a weapon into the departure area. Once there he can pass it on to colleagues flying on an aeroplane.
I thought that was another reason why flight crew are searched like the rest of us, not because we think pilots will smuggle weapons onto a plane but because the person in question might not really be a pilot.
It might be pretty hard to fake up an aircrew id and uniform, but security is trying to stop incidents at the one in a million level so all bases have to be covered.
Back to lurking...