Doubley true at a gun shop. I know a few, where some weapons were left loaded as a last ditch security measure (we can debate whether this is a good idea, but its fact). The drill was always to treat them all like they're loaded. I'm with Kmitch. I don't care if I've just dissasembled my glock, I still work the slide twice before pulling the trigger to lock it back. I've been ten feet away from an ND. It scared me straight.
FQ13