The 23-year-old British runner was cleared to compete in the Beijing Olympics after the ruling by a sports arbitration panel.

Ohuruogu challenged a British Olympic Association rule which automatically bans any athlete found guilty of a doping violation from competing in any future Olympics. She argued her case at a 3 1/2-hour hearing in London yesterday.

"The panel decided that Christine Ohuruogu's appeal had been successful due to significant mitigating circumstances," the BOA said in a statement.

Ohuruogu won the 400-meter world title in Osaka, Japan, on Aug. 29, just weeks after completing a one-year ban imposed by UK Athletics for missing three out-of-competition drug tests between October 2005 and July 2006.

Ohuruogu was the first British track athlete punished for missing three tests. She said she missed the tests when her training schedule was changed with late notice.

Ohuruogu is the latest athlete to successfully appeal against the BOA rule. Former world triathlon champion Tim Don and judo athlete Peter Cousins, who both served three-month suspensions for missing drug tests, are among those who have overturned lifetime Olympic bans.

"The BOA will now be pleased to welcome Christine Ohuruogu as part of Team GB in Beijing next year in the event of her successful nomination by UK Athletics," BOA chief executive Simon Clegg said.

Clegg defended the procedure which led to the ban being imposed in the first place.