PVD still has the baggage/X Ray machines in the lobby. After you check-in at the counter and check your bags and they are tagged, YOU must carry your bags to the X Ray machines. Then you must wait until they clear your bag(s). I have used locks, and the few times that they had to open my bags, I was there to open them.

I know this set up is very rare. In no other airport that I've been to is this done.