I suppose that depends on the state, but I've done this work and there were no requirements for safety devices. It was good money, but I suppose like any contractual agreement, you should be cautious who you do business with.

If they are doing the actual roofing- the demo and re-shingle without safety gear that is a violation. Companies get fined all the time. If you are reporting a violation you have to do it early, OSHA is pretty back logged and might not get out before they are done. Typically roofs in Texas are done in a day to a day and a half. They are betting an OSHA inspection isn’t going to happen during the job.