African-based Kiwi distance runner Zane Robertson believes the threat of Kenya being banned from the Olympics has already had an effect.

The east African country risks being banned from the Rio Olympics, unless it proves it's up to World Anti-Doping standards by the start of next month.

Robertson, who is based in Ethiopia but trains with some Kenyans, is thankful the attention's been put on Kenya.

He's really happy it's starting to be investigated because a lot of people are jumping off the products and the sport is cleaning up.

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Robertson says it's easy to tell who is doping and who isn't.