Money launderers always have a good relationship with various government officials and banks and they also have a good relationship with the government because of which they can launder billions of money out of the country in various ways. If the government does not support them, they are easily caught. But in countries where crimes like money laundering are committed, the government or powerful people of the ruling party are definitely involved and they give shelter to all the problems.
Government officials involved with money launderers will try to pressure them by demanding compensation for covering up their illegal activities. If the money launderers own a casino, they can run it smoothly without fear of other officials. That is why the perpetrators of illegal activities always try to approach officials who can protect them in running their business. The money launderers also know how to please government officials and give all the officials wishes.
Of course, technologies to track these money launderers are still improving throughout each year because these guys are also getting smarter each and every year. Experience help them to evolve and evade the new technologies. Other than that, casinos and authorities are already tired in chasing these guys because they knew that money launderers keeps on outsmarting them, they are just patiently waiting for some mistakes that will reveal these guys in what they are doing before making a move.
Indeed, the technologies to track these money launderers continue to be developed to stop their business operations. However, it still can't stop most of their business because they always get help from people who work in the government. Only by having clean officials willing to work hard to stop it can catch the money launderer. But this is not enough because it requires support from other government parties and unfortunately, many of these officials are in money laundering circles so it is very difficult to catch them.