I think the laws are typically written so that if it's just a matter of an honest accident, you pay a fine, but if you do it with intent, it's a crime. Jeff's pattern of check-bouncing, particularly with the person whose checks bounced three months in a row before he moved and left no forwarding information, would help establish intent.
Does anyone have any guesses as to what he does with his money? Drug addict? Gambling addict? Lots of kids? Fast cars? Maybe he's just bad at business, and can't make ends meet, but I don't see how you can go that far wrong with a partnership split, even if you're not ripping off the rebills...the profit margin is big enough that with even modest signups you should make a decent living.
Anyway, now that a check of his is posted online, if anyone wants to check out a porn site's members area, they could use an online check with his account info.
'Course you'd be committing several federal crimes, and I'd discourage that, but just the possibility should make him sweat.