Doping lab already testing dozens of samples

VANCOUVER, British Columbia -- The scientist in charge of Vancouver's state-of-the-art doping lab says her staff already has tested more than 200 blood and urine samples from Olympic athletes.

Dr. Christiane Ayotte says the new facility at the Richmond Oval aims to process about 2,000 samples -- 1,600 urine and about 400-500 blood samples -- during the games, which open Friday.

There have been no positive tests reported from pre-games testing, but Ayotte says it is impossible to guarantee a completely clean Olympics.

During a tour of the facility Tuesday, Ayotte says 23 scientists are working around the clock at the lab, and that number will soon rise to 35.