The majority of wrestlers do some amount of steroids, Benoit had only a medicinal amount of testosterone in his system along with some pain killers. Pain killers are also highly common among Pro Wrestlers as well due to having to work while injured a lot.

Cheated at work? Never heard anything in that regard, the man prided himself in his work with wrestling it was his life. I've only heard on how hard he worked all the time throughout his career to be one of the best. The only bad thing I heard of him doing was reports of him and his wife having marriage trouble/getting into fights over the years.