I've also always wondered why a guy working for Pret a Manger for example, is considered safe enough to bring 50 bottles of water and coke through the same security checkpoint as where they take 1 bottle of water away from an airline captain.
When asking the security officer about it, they respond with "these bottles come from a secure location". At my airport, this is so untrue, cause whenever I walk to the terminal, stacks of bottles are parked near the lifts underneath the terminal building and anyone (no ID needed, landside) can take them. And besides that, security claims that I as a captain could have interfered with my water bottle, but apparently somebody from a sandwich shop could never do that????
I wish I got the respect of a bar tender when I go to work...