Here are two articles, more than three decades apart, which seemingly prove that faith healing has limits.
First, there’s this item from the September 2 1922 Toronto Daily Star:
I get the impression that the article writer quite enjoyed writing this piece. (I left in the Star want ads bit at the bottom because it seemed to somehow fit.)
Nearly a third of a century later, the July 26 1955 Toronto Daily Star contained this:
Wikipedia has an entry for George Went Hensley. He taught a form of Pentecostalism that “emphasized personal holiness and frequent contact with venomous snakes”.