claim: Levoamphetamine causes lack of focus.
evidence: Henry Gehring -LRB- January 24 , 1881 -- April 18 , 1912 -RRB- was a pitcher in Major League Baseball .. pitcher. pitcher. Major League Baseball. Major League Baseball. He played for the Washington Senators in 1907 and 1908 .. Washington Senators. Washington Senators ( 1901–60 )