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Starting next season, any out-of-bounds call, basket interference/goaltending call and/or block/charge whistles in the restricted arc near the rim can be challenged at any point in a game by a coach — with a catch. A coach (and only a coach) can ask for a monitor review if his team has at least one timeout remaining. Each coach is allowed one review at the start of each game and will be given one bonus review if the first challenge is successfully overturned.

An unsuccessful review will result in the loss of a timeout.

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While out-of-bounds calls are no longer able to be double-checked on the monitor unless a coach challenges the call, we'll still see officials using instant replay to check for "timing mistakes, scoring errors, shot clock violations, 2-point versus 3-point field goal attempts, flagrant fouls" and more. Some of these reviews are important and unavoidable. Others aren't and will continue to creep into not just end-of-game scenarios, but stalls much earlier.

https://www.cbssports.com/college-basketball/news/college-basketball-rules-will-have-coachs-challenges-like-the-nba-but-more-needed-to-reduce-monitor-reviews/