I was a Safety coordinator for my last job and we had a company come in to work on the roof. They would not wear fall protection. So I took a piece of chalk up to the roof and handed to one guy and asked him if he and another person could go down on the pavement and do a chalk outline of his body. He looked at me in confusion and I explained that I would be to busy calling the ambulance to do it when he fell off the roof. Never had a problem with that company after that.