Usain Bolt calls for faith but questions if rivals are drug free

Usain Bolt has told people to “have faith” in athletics, but says he cannot be sure if his Olympic sprint rivals are drug-free.

The run-up to the Games was dominated by Russia’s doping scandal, while American rivals Justin Gatlin and LaShawn Merritt have served drug bans.

Read more: http://www.bbc.com/sport/olympics/37017361