Gaffer Tape said:

Whatever happened to innocent until proven guilty?

I sympathize with you Gaffer, but here are few points to keep in mind

Whose claim is easier to prove? Dayv's claim that he has cancer or Shawn's claim that he does not? Dayv's claim. He can easily get a hold of records that prove it. He could give the doctor's office permission to talk with Jay. Just how would Shawn prove his claim? He can't really unless Dayv confessed to him privately, which Shawn hasn't claimed. Shawn doesn't really even know for a fact that Dayv doesn't have cancer, he just suspects it because Dayv never told him or his ex about it and never asked for donations on his own forum. Also Shawn believes that is is Dayv's style to do this sort of thing to gain sympathy. Just how would Shawn go about proving his claim? He can't get access to any medical records that would prove it. If such records exist at all. Just because you don't have cancer does not mean there are medical records that exist that prove you don't have Cancer. It is almost impossible for Shawn to prove his claim. Therefor, if we are to clear this up either way, the proof needs to come from Dayv.
Who should have the most desire to clear this up? Dayv. If this is not cleared up and Dayv has cancer, and doesn't get the money and help needed to treat it , Dayv could die. But what about Shawn? All he risks is he reputation. So Dayv should have much more of a desire to clear this up than Shawn. Yet he delayed and delayed and delayed. Shawn's initial accusation came on 12/20/2010, Jay's post that Dayv sent him records came on 01/06/2011. That is a 17 day difference. That seems very strange to me. If I had cancer and I needed donations and was accused of lying, I'd give Jay the proof within a week(if not sooner). I'd be professing like crazy that I was innocent and I would probably demand that the accuser be banned. Dayv does not seem to be acting like I would in the same situation. Ask yourself if he is acting how you think an innocent person would act in this situation.
Finally, this is not a court of law. If it were, the burden of proof would most definitely be on Shawn. This is a case a of a forum member asking for money to help treat his cancer. Even if Shawn hadn't made his claim, each and every person on here would have the right to require whatever amount of proof they want before donating. Heck, even if Dayv did proof concretely, no one would be required to donate. Everyone has the right to decide for themselves under what conditions they will donate.