0725 doping 1
Director General of the World Anti-Doping Agency (WADA) David Howman watches on as President of WADA John Fahey speaks during a World Anti Doping Agency Briefing ahead of the 2012 London Olympic Games at the Main Press Centre on July 25, 2012 in London, England. - 

We've heard about the cost of the Olympics by now from all kinds of angles: what it means for the city of London... For the athletes....

But there's one cost of the games you might not have considered: the price for keeping athletes honest and drug free.

Even before the games have begun, the AP is reporting that over 100 athletes have already been kept out of the London Olympics because of doping suspensions.

Shirley Wang has been covering the games for the Wall Street Journal, and she joins us now in today's Mid-day Extra.

Follow Stacey Vanek Smith at @svaneksmith