The world's greatest sprinter says WADA is doing all it can to ensure clean sport.
Anti-doping bodies must become more accountable to the athletes they serve.
The Spaniard also defended himself against past doping allegations.
Key questions about the drug the tennis star tested positive for in January.
Nikita Kamayev had reportedly been skiing when he complained of 'heart ache.'
The confectionary giant is in the middle of a five-year deal as sponsor of the Kids' Athletics program.
Sir Craig Reedie speaks to Newsweek on the difficulties of restoring faith in sport.
The letter shows that the governing body knew of the scale of the crisis as far back as 2009.
Mara Yamauchi, Britain's second fastest female marathon runner, says the organization may be beyond repair.
IAAF President Sebastian Coe also severs ties with Nike
Russia's sports programs as doping machines echo Communist East Germany's drug programs.