Robot Umpires, as they are called, are already in use in minor league games. Umpires have a earpiece that will tell them strike or ball and they simply make the verbal call. The umpire is also there for plays at the plate, foul tips, fair or foul balls, balks, check swings, and anything that requires a human response. The system is called ABS (Automated Ball-Strike System) and is implemented by Trackman.
Robot umpires will continue to be used in Atlantic League for remainder of 2019 season - CBSSports.com
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