The record-breaking performance brought him an invite from the Berlin IAAF Golden League meet, although organising group Euromeetings condemned the move. Revelations in Chambers' autobiography "Race Against Me" brought further controversy as the book had in-depth accounts of his past drug abuse and claimed drug use remained rife in athletics, estimating that half the American Olympic athletes in Beijing had used illegal substances. Chambers signed a statement with UK Sport, verifying that he believed the information to be true, which brought a close to the organisation's inquiries into his drug use. An IAAF investigation concluded that the book demanded no further action on their part. Olympic gold medallist and anti-drugs campaigner Ed Moses gave his support, saying that Chambers admissions provided a useful insight, but that athletes and administrators remained in denial about the high levels of doping in athletics.