Chambers began training in Jamaica in late 2005 in preparation for the athletics season. He faced new challengers in the 100 m as Maurice Greene was no longer a dominant force and Jamaican Asafa Powell was the new world record holder. Chambers began working with Glen Mills, coach of Caribbean sprinters Kim Collins and Usain Bolt. The drug suspension had expired in November but he needed to pass four mandatory drugs tests in order to gain clearance to compete with the IAAF. His comeback was further delayed as he gave an interview with the BBC revealing he began using drugs at the beginning of 2002, not since August 2003, as he had claimed to the IAAF. After further disclosure (that took away his European 100 m gold medal and invalidated his European record of 9.87 s),