Federal investigators searched Diamondbacks reliever Jason Grimsley's house Tuesday as part of their investigation of steroid use. Thirteen agents searched Grimsley's house in Scottsdale, Arizona, for six hours, according to Internal Revenue Service Agent Mark Lessler, who would not say what they found. In seeking a judge's permission for the search, investigators who cracked the BALCO steroid scandal here said Grimsley initially cooperated in the probe. He withdrew his assistance in April, but not before he allegedly made "extensive statements" about illegal drug use, "for the purpose of performance enhancement," according to the court documents.