The first time NBA forward Jontay Porter tried to cheat DraftKings, by sharing information about his health with a handful of unscrupulous gamblers before a game, a monitoring company called US Integrity knew something was amiss before he set foot on the court. The oddsmakers at DraftKings Inc., the popular online betting service, had spotted wagers that raised instant red flags, and they alerted US Integrity so it could sound an industrywide alarm. Porter’s foolproof scam, it turned out, was actually quite foolish. This was Jan. 26, and after a brief absence because of an eye injury, he was set to return to action that night against the Los Angeles Clippers.

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