The 3-Day Right to Rescission applies to door-to-door sales where the price is in excess of $25 (NRS 598.230).

It does not apply to car sales.

15 U.S.C. § 1635 (Federal law) gives a three-day right of rescission of a finance agreement, but that does not apply to the underlying sale.  It does apply to some bank loans. 

For more information, read BankRate.com’s article entitled, “Right of rescission lets you back out of some loans”.