Former world and Olympic champion Sanya Richards-Ross says she backs proposals to rewrite world records – but that not all post-2005 bests will be clean.

Richards-Ross could inherit the 400m record, replacing the 47.60 seconds set by East Germany’s Marita Koch in 1985.

The Jamaica-born American’s time of 48.70 is the fastest since 2005.

And she told BBC World Service’s Sportsworld programme that, should she be awarded the record, she “can vouch 100%” that it is clean.

Although Richards-Ross does not think all world records set after 2005 – the point from which, under European Athletics proposals, records would be reset – are clean, the 32-year-old said: “I think there’s a better chance and a higher ratio of them being clean.”

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