The London Organising Committee of the Olympic and Paralympic Games (LOCOG) will collect and test approximately 5,000 samples at the 2012 Olympic Games and 1,200 at the Paralympic Games.

LOCOG and UK Anti-Doping signed a memorandum of understanding on Wednesday about how UK Anti-Doping will collaborate with LOCOG in delivering the Doping Control Programme at the London 2012 Olympic and Paralympic Games.

Under the authority and direction of the International Olympic Committee and the International Paralympic Committee, LOCOG will collect and test approximately 5,000 samples at the Olympic Games and 1,200 at the Paralympic Games.

Debbie Jevans, LOCOG Director of Sport said, "We need to have a strong message that drugs cheats are not welcome at the London Games. The input of UK Anti-Doping, our new national anti-doping organisation, will assist LOCOG in the delivery of a world class anti-doping programme at the London Games."

Andy Parkinson, UK Anti-Doping Chief Executive said, "UK Anti-Doping is pleased to work with and support LOCOG in the lead-up to the London 2012 Olympic and Paralympic Games. We are partnering with LOCOG to develop a comprehensive programme of testing, athlete education and training for anti-doping volunteers in the lead-up to, and during, the London 2012 Games."

During the Beijing Olympic Games in 2008, 4,770 tests were conducted. Then IOC re-tested 948 doping samples from the Beijing Games, including 847 tests for the new version of the endurance-enhancing hormone EPO, CERA.

There were seven positive results concerning six athletes found out of the 948 samples. This added to the nine positive cases announced by the IOC from the Olympics.