Chinese swimmers' past positive doping tests haunt Paris Olympics

NEW YORK -- A scandal over the handling of alleged doping by Chinese swimmers has flared up at the Paris Olympics, with new revelations this week.

On multiple occasions in recent years, Chinese swimmers have tested positive for banned substances. Despite the cases being blamed on food contamination, they have fanned animosity between the U.S. and China, while authorities' responses have driven a wedge between the American and global anti-doping agencies.