Testosterone can be administered parenterally , but it has more irregular prolonged absorption time and greater activity in muscle in enanthate , undecanoate , or cypionate ester form. These derivatives are hydrolyzed to release free testosterone at the site of injection; absorption rate (and thus injection schedule) varies among different esters, but medical injections are normally done anywhere between semi-weekly to once every 12 weeks. A more frequent schedule may be desirable in order to maintain a more constant level of hormone in the system.  Injectable steroids are typically administered into the muscle, not into the vein, to avoid sudden changes in the amount of the drug in the bloodstream. In addition, because estered testosterone is dissolved in oil, intravenous injection has the potential to cause a dangerous embolism (clot) in the bloodstream.
In 1995, the Golden Triangle region of Southeast Asia was the leader in opium production, yielding 2,500 tons annually. According to . drug experts, there were new drug trafficking routes from Burma through Laos, to southern China, Cambodia, and Vietnam. In January 1996, the Burmese warlord Khun Sa "surrendered" to the ruling junta of Burma. The junta allowed Khun Sa to retain control of his opium trade if he would end his 30-year-old revolutionary war against the government. In 1998, it appeared that approximately 18% of the heroin smuggled into the . came from the Golden Triangle.