RSA 338:2: Bets Void.

Except as authorized by the lottery commission, all bets and wagers upon any question where the parties have no interest in the subject except that created by the wager are void; and either party may recover any property by him or her deposited, paid, or delivered upon such wager or its loss, and repel any action brought for anything, the right or claim to which grows out of such bet or wager.