I once worked at a large industrial plant which had pretty strict rules about what you could bring onto the premise and any kinds of bags could be checked/searc

I once worked at a large industrial plant which had pretty strict rules about what you could bring onto the premise and any kinds of bags could be checked/searched. But they also had a huge locker area at the gate, so it was very easy to leave your stuff there. And also, any checks at the gate were done in a few seconds.