Johnny Depp is suing his ex-wife, Amber Heard, for allegedly defaming him in a Washington Post op-ed. To prove defamation, you have to prove that a false and defamatory statement of fact (not opinion) about you was made to a third party by someone who knew it was false (or should have known it was false) and causing damage to damage to your reputation. Business owners have to face defamation all the time. Can you prove your case? Can Depp?