There are various articles on the web about money laundering and casinos. This thread was started with the question about casinos.
Originally Posted by MisterV View Post
I've long been intrigued with the way people "launder" their ill gotten gains, and am aware casinos are often used for this purpose.

What things do people do to launder money in casinos, and what countermeasures are in place to help prevent it?
And here are the methods listed in Wikipedia:

Casinos: In this method, an individual walks into a casino and buys chips with illicit cash. The individual will then play for a relatively short time. When the person cashes in the chips, they will expect to take payment in a check, or at least get a receipt so they can claim the proceeds as gambling winnings.[14]
Other gambling: Money is spent on gambling, preferably on high odds games. One way to minimize risk with this method is to bet on every possible outcome of some event that has many possible outcomes, so no outcome(s) have short odds, and the bettor will lose only the vigorish and will have (a) "winning" bet(s) that can be shown as the source of money. The "losing" bets will remain hidden.

And here's the article: https://en.wikipedia.org/wiki/Money_laundering

If Mister V wants to discuss other methods of laundering big money I suggest he look at the full article which has ideas that range from buying banks to running the money through big businesses. But when it comes to casinos, this is pretty much how it's done and that's what he originally asked for.