Speaking to reporters at a holiday party Tuesday, Showalter said Davis told him he has received a therapeutic use exemption for Adderall in 2015.
Major League Baseball suspended Davis for 25 games on Sept. 12 following a second failed test for the banned amphetamine. Davis served 24 games of the penalty this year and will miss opening day.
Before being traded to Baltimore, Davis was playing with the Texas Rangers when diagnosed with ADHD. He received permission to use Adderall back then, and not last season.
Davis hit .286 with 53 homers in 138 RBIs in 2013. He batted .196 with 173 strikeouts this year.
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