
For me the dice are there to make that part of the experience feel fair or at least impersonal for the players. I've basically come to the conclusion that while I as DM am not out to get the PCs, the antagonists and sometimes the entire environment (if they're in a dungeon type situation) is sometimes out to get them. I've discussed the things you're talking about with my brother and several other DM:s. If you do discover he's definitely cheating, I'd seriously consider whether he's the type of player you want at your table. I'd tackle that mindset before imposing practical solutions. Ultimately, cheating is an alien concept in D&D, because it misses the point. Rolling in the centre of the table would be fine, but you don't want to impose rules that slow things down, punish everyone, or make an the atmosphere one of mistrust it'll only make everyone feel scrutinised. They'll be just as interested in keeping things honest. Some practical advice would be to privately chat with the other players - ask if they've seen anything suspicious, and if not, to keep an eye on the rolls. With the philosophical bit out of the way. If the suspected player is cheating, then they've lost sight of the purpose of playing D&D, and they'd be better off playing a game with do-overs and save games. This isn't a game that can be 'won' in the traditional sense, and 'beating' the DM should never be the objective. It's a shared experience, a narrative that's shaped by individual decisions, and sometimes random outcomes on a dice. In your shoes, I would highlight the fact that you and your players are on the same team. It works both ways if players suspect the DM is 'out to get them', then there's a breakdown in the relationship. If you can't trust your player(s) are rolling honestly, recording correctly, and not abusing your trust, then something has gone wrong. I have found that sometimes walking softly with the big stick can garner better results than bashing someone over the head with it. People make mistakes from time to time for various reasons. I let the player know that sort of behavior was unacceptable at my online tables and if I caught them doing it again they would be ousted. I confronted that player with my suspicions and they confirmed it and were quite apologetic. They would make a post that might contain an important die roll, see if the roll was the outcome the preferred, and then if it was not they would delete the post and make a new post with a new die roll result. I have only really dealt with a cheating player once, thankfully, and it was on PbP format over at the Paizo forums. In which case, see my above suggestion of being a nice person and providing them with something that is easier for them to see. Or you could even just pick them up a new set of dice and gift it to them as a gesture of saying "Hey, I know that you've been having a difficult time reading your d20, so I thought perhaps you might like a new set." Just an option, but if things seem balanced it is very possibly just that they cannot read the dice numbers. Here's one big question to ask before making a decision I would say is this player having more favorable outcomes with this than failures or less than favorable outcomes? Or does the outcome seem much less random than it should? If so, then I would ask them to either get a new set of dice that can be more easily read and/or if they do not want to purchase new die, offer one to them. What would you do? Have you encountered players who do this sort of thing? I'm thinking of forcing this player to roll a d20 with highly contrasting numbers in the center of the table, and then tell him/her that if she touches the die, the roll doesn't count. I believe he/she then simply makes up a result that suits him/her. I will not go into any detail about the player right now but what he or she does is probably this: he/she picks up the d20 to "look at the result" (the numbers are not filled in properly on it) right after making the roll, thus making the roll invalid- at least that's how I see it. Since then I haven't had any player who I seriously suspected of cheating with dice. They had one d20 lying on a 20 just beyond the DM screen, rolled another identical D20 which they snatched away through said damnable sorcery and then when I lifted the DM screen to look, it was a crit. Once when I was about fourteen a couple of players used foul sorcery to get crits whenever they wanted to.
