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From the spitball to Spider Tack: A brief history of foreign substance use by pitchers in baseball - CBSSports.com
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With MLB set to police foreign substances, Astros pitchers don't appear to be as culpable as some - The Crawfish Boxes
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Trevor Bauer explains what 70 percent of MLB pitchers are doing that's 'a bigger advantage than steroids' | Sporting News
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A look at Trevor Bauer's history of discussing foreign substances on baseballs and increasing spin rate - CBSSports.com
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