Can you buy a used car and return before 72 hours?

Can you buy a used car and return before 72 hours?
In most states there is no "Return Clause" if you went to a dealership to purchase the vehicle. If someone came to your home or place of work and consumated the sale you may have a 72 hour return opportunity. The difference is that if you went to the dealership you actually initiated the transaction and have no remedy. If they came to your home or place of business they initiated the transaction and you may have the right to recind your agreement.