Online casinos ensure compliance with anti-money laundering (AML) laws through the implementation of robust Know Your Customer (KYC) procedures, which involve verifying the identity of their players before allowing them to deposit or withdraw funds. This process typically includes collecting and validating identification documents, proof of address, and, in some cases, information about the source of the player's funds. Furthermore, casinos utilize sophisticated software and monitoring systems to track transactions and identify suspicious activity, enabling them to report any potentially illicit behavior to regulatory authorities.