1.   Experts say that it is nearly impossible to produce high-grade heroin without the cleansing agent.

2.   He says he does not produce heroin himself but only taxes drug traffickers who cross through his area of control.

3.   Poppies are used to produce opium, which can be a narcotic itself or refined to produce heroin.

4.   Although little heroin is produced in Thailand, the country is one of the main smuggling routes for the drug.

5.   Anti-narcotics police backed by soldiers have seized four abandoned refineries and chemicals used to produce heroin in northeastern Burma, state-run media reported Friday.

6.   Base morphine is an opium extract that can be used to produce heroin.

7.   He has helped finance a guerrilla war against the Burmese government by selling opium, which is used to produce heroin.

8.   Mexico is a major producer of marijuana, as well as poppy plants used to produce heroin.

9.   Thailand has denied that heroin is produced within its borders, pointing an accusing finger instead at neighbouring Burma.

10.   The production of opium, from which heroin is produced, is also in the rise in Colombia.