[Percula]

What I have found to work the best at putting a stop to this crap...

When someone asks to see a mucked hand, rather it is yours or someone else's hand. In a loud and angry voice "So what makes you think that he is cheating! I want to know, right now! I have played several hands with this person and if they are cheating I want to know right now damn it! Floor!!!"

When they look at you totally shocked and mutter "I dont think they are cheating. I just want to see what they were calling with", jump all over their [censored]. "Then why the hell are you using a rule that is ONLY there to prevent cheating!".

Once you put it terms of cheating, most people will stop asking because they do not want to look like they are calling another player a cheater.