The entire Russian rowing federation could face a ban of up to four years because three more of its athletes were found to have used prohibited injections, according to The Associated Press. International Rowing Federation president Denis Oswald said Thursday that because the Russian federation was involved in a doping case in 2006, it could be banned for up to four years under a rule calling for stiff sanctions for four or more doping offenses within a 12-month period. On Wednesday, Vladimir Varfolomeev, Denis Moiseev and Svetlana Fedorova were banned for violating rules concerning «use of a prohibited method,» though they didn't test positive for doping. «There were no positive tests and no prohibited substances. There was no blood doping and no injection of EPO. This is simply a case of intravenous infusions without medical justification,» Oswald said at the world rowing championships.