02/15/2014 04:15 EST | Updated 04/16/2014 05:59 EDT

IOC hails anti-doping deterrence; no positive cases more than halfway through Sochi Olympics

SOCHI, Russia - More than halfway through the Sochi Olympics, the IOC's top anti-doping official says he's not surprised there have been no positive tests so far.

Arne Ljungqvist, chairman of the IOC medical commission, says the stringent drug-testing system is working as a deterrent.

He says "it's expected that people don't cheat and those who do are not here."

As of Friday night, Sochi organizers had conducted 1,799 tests, out of total of 2,453 planned for the games. No positive findings have been reported.

Ljungqvist noted that only one positive test was recorded at the 2010 Vancouver Games.

He says "it shows that the program is pretty efficient and serves as a deterrent."

Ljungqvist adds: "I hope it will stay that way throughout the games."

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