I guess you could whip up a batch of fake vomit. But then you have to actually clean up the fake vomit, thereby incurring the very costs (both money and time) t

I guess you could whip up a batch of fake vomit. But then you have to actually clean up the fake vomit, thereby incurring the very costs (both money and time) the fee was meant to compensate you for. If you use the gimmicky plastic variety, I'd think it'd be pretty obvious in photos. Especially if you only buy one fake vomit piece. But I was thinking more in terms of catching at least some of the fraud attempts and making it a bit riskier as a deterrence, rather than a foolproof detection method.