The United States and China yesterday signed their first legal agreement aimed at stopping the spread of illicit drugs. While stopping short of announcing co-operation on extraditing criminals, the two signed a mutual legal assistance pact that would allow them to share forensic evidence and other information in their war against drugs and drug-related crime. The deal came during a visit by US drug-fighting czar Barry McCaffrey. Both countries are particularly concerned with tackling the increasing prevalence of heroin and methamphetamines. The US has identified Burma and Afghanistan as being responsible for producing 90 per cent of the world's heroin. It believes Burmese crime syndicates are producing most of the world's methamphetamines. While most methamphetamines that enter the US are produced in Mexico and California, Mr McCaffrey said the chemicals used to make them were produced in Burma. Therefore a primary goal of the Sino-US alliance is to eliminate chemical components originating in the Golden Triangle. The two countries will share forensic evidence and specific drug intelligence. For example, they will work towards co-ordinating drug 'signature analyses', to clearly identify which cartels are producing which drugs. This will not only include tackling drug use, production and distribution but also extend to related crimes, such as money-laundering and illegal weapons. Mr McCaffrey discussed the potential of the FBI and Chinese officials joining forces to fight arms smuggling. He also said co-operation could include tackling drug use in sport. Both countries are members of the World Anti-Doping Association, which targets drug abuse in sports. In co-operation with co-chairs Australia and Canada, China and the US will work together via the association to combat drug abuse in September's Olympic Games in Sydney. Chinese Public Security Bureau official Yang Fangrui said 'drugs are the source of all evil and a scourge against humanity'. He said 'international problems with drugs need international co-operation'. 'China and the United States are not producers of heroin, but are victims,' Mr Yang said. 'During the opium wars more than 100 years ago, China was victimised by drugs. We will never forget this.' Mr McCaffrey began a 10-day visit through east and Southeast Asia in Beijing. He will also visit Hong Kong, Hanoi and Bangkok.