Mmmm, my sceptical side has been tweeked a little on this. No matter how small a house is you'd think there's space to lay down and sleep it off. You'd offer that to a stranger if you thought they were pretty harmless let alone a celebrity sportsman. JoeO is a big name NRL star and you tell him to go and sleep in his car? Ok, maybe as host you didn't know he wandered off pissed up, maybe you were past it yourself to care. It just strikes me as a bit odd.
If the cop turned up, felt for heat from the radiator and figured the guy in the front was playing possum then you might be inclined to charge him. I'm not saying that happened but you know, wondering if there's a bit left unsaid about the affair. Truthfully I'd say most cops finding someone asleep in the BACK seat might look the other way if they weren't suspicious otherwise.