Jimulacrum
Full House
I find it interesting that this rule exists, as it relies on a thing we can't know for sure (whether/when the player knew).fwiw Robert's Rules of Poker offers this recourse when a player takes an aggressive action while knowing of a fouled deck. It is the only part of RRoP that I know of where a reverse freeroll on the fouler is suggested:
I'd be inclined to apply that here for the same anti-freeroll reasons. (TDA does not mention a reverse freeroll for a fouled deck as far as I'm aware.)
I get wanting to penalize to discourage people from trying to freeroll, but the other side of that is a novice player who doesn't notice he has

or just paired his
with a
on the board getting burned for an innocent mistake that is primarily the fault of the house (for allowing a fouled deck in play). And unless we assume people are going to be honest, we can't really know whether he was just playing his hand or trying to pull a fast one.
the opponent had should've been discarded... talk about awkward. Pot had already been awarded and the player didn't want to give their half of the pot back. We settled on me getting half of their half and they bitched the rest of the orbit. I don't think they played mixed games the rest of the day after that.
or whatever when a 2 landed on the kill board, and it goes to showdown like that, yes, your hand is dead. You really have to bake it into your routine for this game to check your cards every round and make sure you've discarded, ideally before you take your action (since that's the only point truly under your control).