I have to go look at a building that a drunk apparently tried to turn into a drive thru. One thing I'm wondering is: if I see something that makes me think the thing is about to cave in.....should I just declare (then and there) that no one from that point on should enter unless they are a contractor? (Or even if they are a contractor. If it is unsafe to enter (i.e. there is a chance of collapse).....how can anyone work on it (at least from the inside)?)