DJ Stone from Fort Walton Beach (FL) Truck 6 sent in these photos of a drop bar installation with a pad lock. They ran into this in an office area of a large warehouse style building. Obviously, once the padlock is in place, it takes away a few of the options we may use to defeat the drop bar from the outside.. While some of the bumping the bar from the outside trick may not work on this one, the rotary saw treatment to the bolts would definitely still defeat this. Another point to mention is that you would have no way of knowing if this was present from the outside.
The arrows in the photo above show where the padlock would be installed on the drop bar to prevent it from being bumped out of place.