GLASGOW, Scotland (CMC):

Sprint superstar Usain Bolt has criticised anti-doping officials for reducing Tyson Gay's doping ban after he tested positive for an anabolic steroid last year.

Gay and Bolt's fellow Jamaican sprinter Asafa Powell, both 31, failed drug tests for oxilofrine, in July 2013.

Gay was given a one-year ban and Powell was initially suspended for 18 months.

"I'm not really happy with the situation and with how it was done," Bolt said.

"I think for someone like Asafa [Powell] to get a ban of 18 months for that [stimulant oxilofrine] and then Tyson Gay gets just one year because of co-operating, I think it is sending a bad message into the sport - that you can do it, but if you co-operate with us, we'll reduce the sentence."

Powell claimed his ruling was "unfair and unjust", and said a legal supplement he took, Epiphany D1, was contaminated.

He appealed to the Court of Arbitration for Sport and his ban was subsequently reduced to six months.

Former world champion Gay

Former 100m and 200m world champion Gay could have been banned for up to two years but received a lighter penalty because he co-operated with the US Anti-Doping Agency.

"I don't think that's the right way to go," Bolt insisted.

" ... because you are pretty much telling people that this is a way out. It's a way of beating the system".

Both Gay and Powell have now returned to action.