Returning a used car the same day?

I am working on a hypothetical case where a buyer is returning a used car that same day because the cars previous owner was not the celebrity that he though owned it prior to him. (negligent misrepresentation) This gave the car more value. I am looking for RCW's along with other laws about contracts, returning vehicles, and title.|||The problem with names are that they're quite vague, but not necessarily untrue.