Testing for amphetamines didn't begin until the start of the 2006 season, after significant pressure, including the death of Baltimore pitcher Steve Bechler from ephedra (another stimulant) in 2003. The most significant post-ban issue has been the sharp increase in players receiving Therapeutic Use Exemptions (TUEs) for prescription stimulant medications, such as Adderall and Ritalin, used to treat attention-deficit hyperactivity disorder (ADHD). Critics have pointed to the TUE system as a potential loophole for players to legally obtain performance-enhancing stimulants. The number of TUEs for ADHD jumped dramatically, from 28 in 2006 to 103 in 2007, representing about 7.6% of all MLB players at the time.
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