Junior welterweight contender Amir Khan, during a recent appearance on BBC Radio 5 Live, said compulsory drug testing must be introduced in boxing in an attempt to clean up the sport. Khan lost his WBA and IBF belts to Lamont Peterson in December but the Washington fighter has recently failed a random drug test, which canceled their planned May 19th rematch in Las Vegas. 

Peterson, who tested positive for synthetic testosterone, recently apologized for the rematch being canceled, but Khan says it will take a lot more than a simple apology to make good on what happened.

"It will take more than an apology for what happened last December, my life was at risk. One punch can change a fighter's life," Khan said.

"The way he kept coming forward after he was put down twice in the first round, the way he was recovering, I knew this was not the same Lamont Peterson I had been watching in videos, this guy was totally different. It was like fighting two people in the ring. I was hurting him and putting him down and he was still coming forward.

"I have fought big punchers like Marcos Maidana and other names out there and he seemed to punch harder, be a lot fitter than them. It just shows that performance enhancing drugs do make a difference and I saw the difference. He should be punished for what he did."