Many countries now operate a leniency program for participants in cartels, whereby a successful "whistle-blower" can obtain total immunity from civil and criminal penalties in return for telling the competition authority about the existence of a cartel. This policy has proved enormously successful in the US and the European Union. Leniency programs have been adopted in Japan [ PDF ], South Korea, and Singapore. OECD has produced a chapter on drafting and implementing an effective leniency program [ PDF ].