updated 6:29 a.m. ET Jan. 16, 2009

OSLO, Norway - Norwegian ski jumper Lars Bystoel, who won a gold and two bronze medals at 2006 Turin Olympics, says he tested positive for a banned substance.

The 30-year-old champion confirmed in Friday's edition of the Se og Hoer magazine that he tested positive at a Norwegian Cup competition in Vikersund in November. He could face a suspension.

"It is correct that I have tested positive for doping. This is a substance that does not enhance performance and was not taken in competition," Bystoel said.

He refused to identify the substance, but Se og Hoer said it was tetrahydrocannabinol, or THC, which is found in marijuana and hashish.

Bystoel was dropped from the national team in 2007 after being detained at the Hemsedal ski area for public intoxication and being arrested later in the year on charges of drunken driving.

National ski-jumping team head of sports Clas Brede Braathen said he had known about the positive test for a while and was disappointed.

"I hope he uses this to move on in life, and once and for all get away from these circles that time after time cause him to end up in situations that I am sure Lars does not want to end up in," Braathen.

He added that Bystoel is no longer part of the national team system and largely practices on his own.

In Turin, Bystoel took individual gold in the normal hill and bronze in large hill, as well as bronze for team large hill. He also won bronzes in team large hill at the 2003 and 2005 World Championships and team gold at the 2006 Ski-Flying World Championships.