MLB players must wear Kinexon contract tracing devices at the

MLB's new COVID-19 protocols stricter – and could result in suspension

MLB players not required to get COVID-19 vaccine under protocol agreement - ESPN

Boston Red Sox pitcher Matt Barnes tests positive for COVID-19, multiple other players in contact tracing protocols

MLB players to wear electronic tracers, face discipline in 2021

MLB players to wear electronic tracers as part of new health protocols - Sports Illustrated

MLB Players to Wear Electronic Tracers, Face Discipline – NBC Los Angeles

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MLB To Require Players, On-Field Staff To Wear Contact Tracing Wristbands For 2021 Season; Vaccination 'Will Be Voluntary' - CBS Los Angeles

MLB Players to Wear Electronic Tracers, Face Discipline – NBC Los Angeles

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NFL Plans to Use Tech and Lessons From Baseball to Forge Ahead - Bloomberg

MLB, MLBPA agree to health and safety protocols for 2021 season - The Washington Post

Baseball Devises New Pandemic-Related Rules for 2021 - The New York Times