For the record, when I said “gun lure”, I was referring to this one:
The ability to put a gun on the ground and have a guard notice it, and then remove it to a locker is clearly programmed into the game intentionally and is a mechanic that IOI wanted to be there. That is neither a glitch nor an exploit. It’s just part of the way the game is designed to work. One of the established rules, if you will.
The other one, that I linked here, can effectively be used to get an NPC to follow you anywhere on the map and is not the same thing.