Bat sensors can now be embedded inside baseball bats during all minor league games in the 2019 season. This change does not affect the big leagues, where all such sensors are prohibited in games.
Representatives from Blast Motion and Diamond Kinetics confirmed the news to SportTechie. In 2018, embedded sensors were permitted in bats only in rookie ball—the lowest level of the affiliated minor leagues. The other leagues, from Class A on up through Triple A, could only use sensors that attached to the knobs of the bats.
In 2017, the only in-game of use of sensors were the ones attached to the bottom knob of bats in rookie ball: the Gulf Coast League and the Arizona Summer League.