That question is at the center of a federal investigation, as the FDA's official designation of THG as illegal puts manufacturers on notice that the government will crack down on anyone caught selling it. After testing positive for the drug, U.S. track and field champions Kevin Toth and Regina Jacobs were questioned before a grand jury in October 2003. Both athletes have been customers of a nutritional supplement supplier named Bay Area Laboratory Co-Operative, or BALCO, and sources say Toth and Jacobs were asked to testify as to whether they bought THG from BALCO. BALCO was raided by the Internal Revenue Service and local drug agents in September 2003. An attorney for Victor Conte, BALCO's founder, has said his client is the target of the grand jury probe and is innocent of any wrongdoing. Conte has also been fingered by British sprinter Dwain Chambers, who admits he tested positive for THG during an out-of-competition test in Germany. Chambers says through an attorney that he was assured by Conte the supplements he was given were within international rules. Alleging participation in an illegal steroids distribution network, a federal grand jury indicted Conte, BALCO vice president James Valente, personal trainer Greg Anderson, and sprint coach Remi Korchemny on Feb. 12, 2004. Conte pleaded guilty in July 2005 to money laundering and a steroid distribution charge; dozens of counts were dropped. In a plea agreement, a federal judge sentenced Conte on Oct. 17, 2005, to four months in prison and four months of home confinement. Valente was sentenced to probation after pleading guilty to reduced charges of steroid distribution and Anderson was sentenced to six months after pleading guilty to money laundering and a steroiddistribution charge. Korchemny is expected to get probation at a later sentencing date. After pleading guilty in April 2006, to one count of conspiracy todistribute steroids, Patrick Arnold, the chemist who created a previously undetectable steroid, was sentenced to three months in prison and three months home confinement on Aug. 4, 2006. He is the last of the original five defendants connected to BALCO.