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David Briggs, the chief executive of GeoComply, gestures to a map that flashes green dots to show where sports bets are being made, at Resorts Casino in Atlantic City, N.J., Nov. 18, 2018. As sports betting has boomed from a niche hobby to big business in New Jersey, so too has the high-stakes battle to protect the integrity of professional and collegiate games — and the betting systems themselves. (Mark Makela/The New York Times)