Former World and Commonwealth champion Liz McColgan believes there should be no second chances for drugs cheats in athletics.
Sprinter Dwaine Chambers has served a two-year ban from the sport after testing positive for the performance-enhancing drug THG.
But McColgan believes Chambers' return to the track makes a mockery of her own fight to succeed within the law.
"My thoughts are drug cheats should be out of the sport for life," she said.
McColgan won gold in the 10,000m at the 1986 Commonwealth Games in Edinburgh and four years later in New Zealand.
"It just makes everything that I've done meaningless"
She also took the gold at the World Championships in Tokyo in 1991.
"I worked very, very hard to get to where I got to," she told BBC Sport.
"I always say I wasn't the most talented person when I was a youngster.
"I just worked my socks off and became a world champion and won medals.
"So for someone like Dwaine to come along and cheat, it just makes everything that I've done meaningless."
Chambers qualified for next month's World Indoor Championships and was reluctantly picked for the GB team UK Athletics who feared an expensive legal case if he had been omitted.
The 29-year-old faces a lifetime Olympic ban and was set to launch an appeal but missed last Friday's British Olympic Association deadline.
However, there remains an opportunity for Chambers to appeal the decision through the High Court.
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