Sports betting is a booming business. The FBI's NBA probe is putting it in the spotlight

The stunning indictment that led to the arrest of more than 30 people — including Miami Heat guard Terry Rozier and other NBA figures — has drawn new scrutiny of the booming business of sports betting in the U.S. The multibillion-dollar industry has made it easy for sports fans — and even some players — to wager on everything from the outcome of games to that of a single play with just a few taps of a cellphone. But regulating the rapidly-growing industry has proven to be a challenge. Professional sports leagues’ own role in promoting gambling has also raised eyebrows.