MLB Pitchers Custodio and Sierra: 56-Game Ban for Drug Violation (2026)

Major League Baseball's minor leagues are cracking down on performance-enhancing drugs, and two young pitchers are the latest to face the consequences. San Francisco Giants prospect Luis Custodio and free agent Luis Sierra have each been handed a 56-game suspension for violating the minor league drug program. This news serves as a stark reminder of the league's commitment to fair play, even at the developmental levels.

Custodio, a 21-year-old left-handed pitcher, tested positive for Stanozolol, a banned substance. Last year, he was pitching in the Dominican Summer League after recovering from Tommy John surgery, posting a 7.94 ERA in 12 relief appearances. He originally signed with the Giants in 2023.

Sierra, a 20-year-old right-hander, also tested positive for Stanozolol. He had signed with the Baltimore Orioles last June, receiving a $10,000 bonus. His stats with the DSL Orioles included an 0-2 record and a 9.95 ERA across 11 relief appearances before being released on January 5th. His suspension will begin when he signs with another major league organization.

But here's where it gets controversial: This isn't an isolated incident. Including Custodio and Sierra, there have been three players suspended this year. Max Kepler, a free agent outfielder, received an 80-game suspension under the major league program for testing positive for Epitrenbolone.

What do you think about the frequency of these suspensions? Do you believe the penalties are harsh enough to deter future violations, or should they be more severe? Share your thoughts in the comments!

MLB Pitchers Custodio and Sierra: 56-Game Ban for Drug Violation (2026)
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