Monty Roberts does put clothesline in horse's mouths....
In Monty Roberts defense, he only puts the rope under the upper lip as a solution to severe bucking problems. He says that it is better to make a horse uncomfortable than to have someone get hurt badly or killed from getting thrown off. The horse is usually destroyed or gets abused by someone trying to fix him. If a few rides in a buckstopper will fix the horse then I think it's more humane and practical than a lot of methods. I have only seen him once but I was as impressed if not more so with him as I am with CA or PP. His book changed my life and the way I work with horses.
There's nothing like the Rockies in the springtime... Nothing like the freedom in the air... And there ain't nothing better than draggin calves to the fire and there's nothing like the smell of burning hair. -Brenn Hill