ROME: FINA, swimming's governing body, plans to retest doping samples from last year's swimming world championships.
FINA said it would examine samples to check for the presence of "plasticizers", tiny particles of plastic left over from blood bags.
In September, FINA said that of the 391 tests taken at the July 15 to August 2 Rome championships, none came back positive. A total of 162 samples were screened for the blood-boosting hormone EPO.
FINA will also look into the introduction of a "biological passport" program to monitor swimmers' blood profiles for evidence of doping.
FINA considers storing drug samples for at least eight years after world championships for possible future retests.