MIAMI (AP) — As a new NBA season opened this week, coach Rick Carlisle and the Indiana Pacers received their annual league-mandated briefing on the do's and don'ts of gambling.

Betting in casinos is generally allowed. Betting on other sports, provided it is legal, is also allowed.

Betting on NBA basketball is not.

For veterans of the sport, it's the type of training that can seem routine — almost boring, perhaps. But the potential repercussions for breaking the rules are now abundantly clear after Portland coach Chauncey Billups and Miami guard Terry Rozier were among nearly three dozen people arrested Thursday for what federal law enforcement officials described as their involvement in various illicit gambling activities.

The developments pose an unexpected challenge for a league that

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