[gonvaled]

Parafrasing Clarke, "A sufficiently complex system is indistinguishable from magic".

You, and nobody, will not notice small probabilistic variations. Whenever you discover it (let us say, 30 years from now), you will be told that there was a difficult to find bug in the random generator. Nobody will be prosecuted.

It could be a couple of lines of code in a subsystem somewhere, available only to a handful of engineers, and understood only by two of them - both of them with nice bank accounts in the Cayman Islands.

[ianstallings]

This is true but the Gaming Control Board audits the software and they are also audited by outside parties. Could they cheat? Of course. So can human dealers, rigged card shufflers, etc. But Las Vegas makes its money from table games, slot machines, and apparently poker machines that play so well you'd have to be a pro to win consistently. It's not in their best interest to cheat you. As always in life: your mileage will vary.