For the first time in the history of the NBA, coaches will be allowed to make challenges, beginning in the 2019-20 season. The rule, which has been tested in the developmental G League for the past two years, will give coaches the chance to challenge one call over the course of a game and will be on trial for this coming season. This is only allowed once, even if you are successful with the challenge, and coaches are required to have and take a timeout in order to make the attempt.
It can be used to try to overturn a number of calls, but it will not be able to be sued in the last two minutes of the fourth quarter because all potential out-of-bounds calls, goaltending, or interference calls will be automatically reviewed. This is progress for sure, though it is tough to see how it’s going to go right out of the gates.