* IOC expect more positive tests from London * Russia leads the count on positives * Weightlifting has most cases, followed by athletics (Adds details) By Karolos Grohmann LAUSANNE, Switzerland, Dec 7 (Reuters) - Re-tests of doping samples from the 2008 Beijing and 2012 London Olympics have found another three positive tests to take the tally to 101 and more are expected, the International Olympic Committee (IOC) said on Wednesday. IOC medical director Richard Budgett said re-tests for Beijing were now finished due to a statute of limitation but he said he expected more positive tests from the London Games to emerge in the coming weeks and months. "It is an ongoing programme," Budgett told reporters. More...