Monte Carlo - The tighter whereabouts system, under which athletes must be available for drug tests 60 minutes each day, is fair and vital in the fight against doping, the ruling athletics body IAAF said on Thursday.
The IAAF said in a statement that its athletes have had a similar system for a dozen years and that the issue only became prominent now that other sports have to follow it under the new World Anti-Doping Code regulations.
The new system for out-of-competition testing has been criticised by athletes across the world of sport in recent weeks.