David Millar intends to turn down a place at the Olympic Games in London even if rule changes allow him to participate.
The road cyclist and Scottish Commonwealth gold medal winner said going as the "black sheep" would not be a "joyful experience".
Millar, 35, was in 2004 suspended from cycling for two years after he admitted using the "blood-boosting" drug EPO. Now back at the top of the sport – and campaigning to prevent others making the same mistakes – he is still subject to a lifetime Olympic ban imposed by the British Olympic Association under its byelaw for those found guilty of taking performance-enhancing drugs.
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