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The stunning indictment that led to the arrest of more than 30 people , including Miami Heat guard Terry Rozier and other NBA figures, on charges of illegal sports betting has drawn new scrutiny of the booming business of professional sports gambling across the U.S.

Since widespread legalization, the multibillion-dollar industry has made it easy to place wagers on everything from the outcome of games to that of a single play with just a few taps of a cellphone. It’s just about impossible to go to a basketball, football, baseball or other pro game today — or watch a matchup on TV — without seeing ads for sports betting.

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Fans can place wagers from their stadium seats, while “B

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