 Based on several media reports that appeared on June 7, reliever Jason Grimsley admitted to taking illegal performance-enhancing drugs, specifically human growth hormone, as part of the IRS probe of BALCO, best known for similar allegations concerning San Francisco Giants star Barry Bonds.IRS agents apparently made an extensive search of Grimsley's Scottsdale, Arizona residence seeking evidence.Grimsley and team officials declined comment before the June 6 home game vs. the Philadelphia Phillies.