The current anti-doping code revised the "whereabouts" system in place since 2004, requiring athletes to select one hour per day, five days a week to be available for no-notice drugs tests. However on January 1, 2009 this was extended to seven days a week and unlike the previous system athletes have to be available for the full hour.
A significant number of sports organizations, governments, athletes, and other individuals and organizations have expressed support for the new whereabouts requirements. The International Association of Athletics Federations and UK Sport are two of the most vocal supporters of this rule. Tennis all-time great Roger Federer has also expressed approval for rigorous testing saying that "the guy is cheating and they are smart, right?"  Both UEFA and FIFA have rejected the system citing privacy concerns, as has the BCCI.
WADA has also published a Q&A explaining the rationale for the change.