Yes sure, everything on illegal activity will be watched by the government around the world. Not only the casino but also the exchange that is used for money laundry will be seized by the government. Now the question is how can they detect it?, For me, it's just a business competition between the casinos. Nothing is perfect in the world. The casino may accept the illegal money without them realizing it, so that it is known by business partners then report it to the authorities. This applies to everything, mixers are good businesses, and gambling is also a good business that can print money quickly and a lot, that is the fact, so they will knock each other out on the business.