Asafa Powell cannot use ignorance as an excuse for his 18-month drug ban, says former 100m world champion Kim Collins.
Former 100m world record holder Powell said he took the substance unwittingly in a supplement given by his former trainer.
"If you say you trust people, and that's what happens, you're just as bad as them," Collins told BBC Sport, adding that cheats need to "man up".
Former world 100m record holder Asafa Powellhas been hit with a 18 months ban competition for his positive drugs test.
At the National Senior Championship, June 21, 2013 after the 100m finals, Powell returned positive analytical finding for a stimulant, oxilofrine. He blamed his former Canadian physical trainer Chris Xuereb for positive, which was found in supplements given to him.
The 38-year-old said: "You say you trust this guy, and he got you into this trouble. What can you say? You trusted him.
"But I'm on my own. So I have nobody about whom I can say, 'I trusted this person.' I take full responsibility for what happens.