Before a Supreme Court ruling in 2018 opened the flood gates to legalized sports betting across the country, the proposition bet or prop bet – picking one statistic in a game to place a wager on that has nothing to do with the game’s outcome - wasn’t a big factor in online sports betting. Now it’s ubiquitous, causing a huge headache for leagues and making fans question the integrity of the games. USA TODAY Sports Reporter Steve Gardner joins The Excerpt to explain.

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