Question 364: When a person accused of theft is brought before some people here, they burn him with a heated piece of iron. If he admits his act, it will be all right; otherwise, fire will cause him no harm. Is such behavior permissible according to Allaah’s religion?
Answer: This is a prohibited groundless behavior. Moreover, it falls under prohibited jugglery which renders one’s creed corrupt. Thus, it has to be avoided and other lawful methods of interrogating convicts have to be adopted... read more here.