It's been rumored that the Astros used an electronic device taped to their body that transmitted vibrations based on what pitch is coming. Here is a close up slow motion gif of
Houston Astros Closer Makes Special Admission About Martin Maldonado - Sports Illustrated Inside The Astros
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Astros' Jose Altuve Denies Wearing Electronic Device Amid Sign-Stealing Scandal, News, Scores, Highlights, Stats, and Rumors
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Houston Astros Closer Makes Special Admission About Martin Maldonado - Sports Illustrated Inside The Astros
Martín Maldonado's bat: Astros catcher made to switch before Game
Astros try out technology to speed up at-bats, and slow down cheating
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Albuquerque The Magazine, December 2022/January 2023 by Albuquerque The Magazine - Issuu
Astros try out technology to speed up at-bats, and slow down cheating