Belarussian shot putter Nadzeya Ostapchuk has again failed a doping test in a competition against New Zealand double Olympic gold medallist Valerie Adams.
Ostapchuk is one of six athletes named by the sport's governing body for failing re-testing of samples taken at the 2005 world championships in Helsinki, Reuters reports.
All are now subject to the disciplinary procedures of the International Association of Athletics Federations (IAAF).
The other athletes named were Ivan Tsikhan, former Olympic and three-times world hammer champion, Andrei Mikhnevich and Vadim Devyatovskiy, all from Belarus, and Tatyana Kotova and Olga Kuzenkova of Russia.
Ostapchuk was stripped of her shot put gold medal from the London Olympics last year after testing positive for a banned anabolic steroid, handing the gold to Valerie Adams.
It is now possible the Aucklander will be promoted to silver for the 2005 world championships, behind the Russian, Olga Ryabinkina.
Tsikhan won the gold medal in Helsinki, while Devyatovskiy took silver. They finished in the same order at the 2008 Beijing Olympics, lost their medals after doping tests but won appeals against the decision to the Court of Arbitration for Sport.
Tsikhan did not compete at last year's London Olympics following a request by the IAAF.
Shot putter Mikhnevich, the 2003 world champion, won an Olympic bronze medal in Beijing in 2008.
Long jumper Kotova was a bronze medallist at both the 2000 and 2004 Olympics and won three successive silver medals in the world championships, while Kuzenkova won hammer gold at the 2004 Olympics and the world championships in Helsinki.
Commitment to uncover drug cheats motivating - Adams
Valerie Adams says it's fantastic that athletics officials are working hard to uncover drug cheats, after Adams' nemesis Nadzeya Ostapchuk was found to have failed another drug test.
Adams says she finds it very motivating that athletics' governing body, the IAAF, is committed to making the sport as clean as possible.
Adam's Manager Nick Cowan says Ostapchuck is facing a two year ban which could be doubled as it's her second drug offense.
He says a four year ban could end the athletics career of the 32-year-old Belarusion.
