If you're talking about gambling over the internet, anything can be rigged. In fact, a lot of new casinos pop up with deposit bonuses just to get your funds and then either you cannot withdraw or you're subjected to playing games that will make you a loser every time. I would urge you to look into transparent and provably honest casino games if you feel like it's a possibility that you are being cheated. Where there's smoke there's fire as they say and if you're getting a bad feeling from the site you're choosing to gamble on, either research and make sure that it's legitimate or find a new site that you feel is honest.