Seven-time Olympic swimming champion Caeleb Dressel says he is not confident rivals are not doping at the Paris Olympics.
The build-up to the Games’ swimming event has been overshadowed by the continuing row over positive drugs tests from 23 Chinese athletes in the run-up to the last Olympics.
Earlier this month an independent report backed the decision not to dispute Chinese authorities’ claims the swimmers ingested tri-meta-zi-dine (TMZ) by contamination.
Eleven of those swimmers will compete for China in Paris.