Adam Silver, the commissioner for the National Basketball Association (NBA), has called for the laws on sports betting in the US to be changed, urging Congress to adopt a federal framework that allows individual states to authorise betting on professional sports.

The NBA has been opposed to the expansion of legal sports betting for the past two decades, alongside the other major professional sports leagues in the US, following the passage of the Professional and Amateur Sports Protection Act (PASPA) in 1992 which prohibited all but four US states from authorising sports betting.

Silver said that despite these legal restrictions, sports betting is widespread across the country and is a "thriving" underground business that operates free from regulation or oversight.

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