Brett Clothier

"Unfortunately, sophisticated doping substances may only be detectable within an athlete's sample for a few days or even hours after administration."

"Anti-doping organisations need to be able to test athletes without notice on the day and hour of our choosing, otherwise anti-doping programmes will not work, and dopers will easily avoid detection."

"Anti-doping organisations need to be able to test athletes without notice on the day and hour of our choosing."