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Message: <blockquote data-quote="Stormonu" data-source="post: 5249420" data-attributes="member: 52734">They do sell loaded polyhedral dice (Unfortunately, I had a player who purposely bought such dice and tried to use them in a game), so unless these are transparent dice, there's a slim chance something is up with them.I suppose the easiest way to find out if they are tainted is to have a "session" where you just sit down and roll them about a hundred times (or more) and record the results.  If they're skewed, a large die roll sample should bear this out.Another method would be check to see if the dice has been shaved - this is a method of removing a tiny bit from the various faces of the dice to bias the result.  If I remember correctly, the shaved faces would be the ones opposite the high sides (so the "low" numbers are heavy and end up on the bottom).I also seem to recall some method involved with immersing the dice in water to determine if they are biased (with weights), but my google-fu isn't all that great tonight.<a href="http://www.gamescience.com/" target="_blank">Gamescience</a> also has a good (though long) spiel about dice and how they generally have some bias due to the imperfect manufacturing of most dice (of course, save for Gamescience dice).  There is a possibility the dice may be biased without it having been bought specifically for that purpose.</blockquote>