A third athlete from the acclaimed track group HSI has tested positive for a steroid, according to several people with knowledge of the results.

Sprinter Mickey Grimes tested positive for norandrosterone, the same steroid for which Larry Wade, an HSI teammate, also tested positive.

Grimes, who tested positive at the 2003 Pan American Games for the stimulant ephedrine, would face a two- to three-year ban if found guilty.

Grimes, who was scheduled to compete in Friday's 200 meters at the U.S. Olympic Trials at Alex G. Spanos Sports Complex, raced in last weekend's 100 but did not make the final. Wade has withdrawn from this weekend's 110 hurdles because he injured his arm during practice Thursday, his coach John Smith said.

Torri Edwards, also in HSI, tested positive for a banned stimulant nikethamide at an April meet and faces a possible two-year ban. Edwards qualified for the U.S. Olympic team by finishing second in the 100 last weekend, and Friday she ran the fastest time (22.60 seconds) in the 200-meter quarterfinal heats. She has acknowledged using the substance but said she took it unknowingly in what she believed were glucose tablets given to her by her physical therapist. She has an arbitration hearing Monday.

HSI is arguably the most prominent track group in the country. Based in Los Angeles, it is home to former 100 world record holder Maurice Greene, who won the 100 last weekend, and Inger Miller, a former world champion sprinter. Lake Braddock High's Allen Johnson does not train in Los Angeles, but he employs HSI manager Emanuel Hudson.

Hudson declined Friday to comment on any of the cases. According to a source, Wade's case is not yet a confirmed doping violation by the world governing body of track and field (IAAF), even though he has received a letter notifying him of the positive test. IAAF officials declined to confirm the positive result when contacted.

It is unclear how far along Grimes's case is. His positive result came from an out-of-competition test in Los Angeles May 25. The IAAF could not immediately be reached.

"I cannot speak on any of these subjects dealing with anybody I represent," Hudson said Friday. "We cannot respond to all of these questions. . . . When I have something to say, I will say it."

After Grimes, 28, tested positive at the Pan American Games last August in Santo Domingo, he was forced to relinquish his individual gold medal. The U.S. 4x100 relay team also had to give up its gold.

Norandrosterone is a metabolite of the steroid nandrolone. It is found in many dietary supplements that can be purchased over-the-counter.

Torri Edwards -- edging Lauryn Williams, left, for 2nd in Saturday's 100-meter final -- says she took banned stimulant unknowingly in therapist-provided tablet.