What is the ruling on commercial dealings with a person who is rumored to practice sorcery or to undo sorcery?

If the magic was undone by lawful means, there is no harm in dealing with him regarding his money.

However, if the magic was undone through sorcery and charlatanry, then dealing with him requires elaboration: - If he has other money besides the money from undoing the magic, dealing with him is permissible, though disliked, unless one is certain that what he is dealing with is the very unlawful money. - But if he has no money except from undoing the magic, then dealing with him is impermissible.