In October 2003, Chambers was revealed to have tested positive for the banned steroid tetrahydrogestrinone (THG). He was given a two year ban by UK Athletics after a disciplinary hearing on 22nd February 2004. Chambers' coach, Remi Korchemny, is one of four men currently under investigation in the United States on charges of distributing illegal drugs to athletes.

He is currently considering a move to the NFL.