American 400 meters sprinter Alvin Harrison has accepted a four-year ban handed down for doping offences, the US Anti-Doping Agency (USADA) announced on Tuesday.
The 30-year-old Harrison, a 2000 US Olympic 400m relay gold medalist and silver medalist over 400m, was banned for his role in the BALCO affair and not for testing positive.
Harrison's twin brother Calvin is currently banned for doping offences.
A USADA statement said Tuesday: "Harrison admitted to using numerous undetectable performance-enhancing drugs.
"These included anabolic steroids known as `the clear' and `the cream,' EPO, insulin, growth hormone and modafinil."
The BALCO laboratory in California, which is being accused of supplying a number of top athletes with a range of banned substances including steroids, is at the center of the biggest drugs scandal in American athletics history.
A number of top athletes were implicated in the scandal. A court case is still ongoing in San Francisco.
BALCO Labs executive director Victor Conte, who is accused of steroid distribution, two weeks ago asked a US federal court to drop the charges against him because of procedural errors made at the time of his arrest.
The Internal Revenue Service investigation sparked grand jury hearings that saw a number of star sports figures testify, including baseball slugger Barry Bonds, boxer Shane Mosley and athletics stars Marion Jones and Tim Montgomery.
Conte and three others face steroid charges that include the creation of the once-undetectable steroid tetrahydrogestrinone (THG).
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