A couple more things that may be of interest from Alfred McCoy, author of The Politics of Heroin: CIA Complicity In The Global Drug Trade:

PD: How does the CIA's policies affect drug interdiction? I've spoken for example to former Drug Enforcement Administration officer Michael Levine, who has expressed anger that he was pulled off cases because he got too close to someone who, while being a big trafficker, was also an asset of the CIA.

AM: Mike Levine speaks from personal experience. In 1971 Mike Levine was in Southeast Asia operating in Thailand as an agent of the U.S. Drug Enforcement Administration [DEA]. At the same time I was conducting the investigation for the first edition of my book.

Mike Levine said that he wanted to go up country to Chiangmai, the heroin capital of Southeast Asia at that point, the finance and processing center and hub of an enterprise. He wanted to make some major seizures. Through a veiled series of cut outs in the U.S. embassy in Bangkok, instructions were passed to his superiors in the DEA, who told him he couldn't go up and make the bust. He was pulled off the case.

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That meant that when the CIA was running one of its covert action wars in the drug zones of Asia, the DEA would stay away. For example, during the 1950's the CIA had this ongoing alliance with the nationalist Chinese in northern Burma. Initially mounting invasions of China in 1950-51, later mounting surveillance along the border for a projected Chinese invasion of Southeast Asia. The DEA stayed out of Southeast Asia completely during that period and collected no intelligence about narcotics in deference to the CIA's operation.

Let's take two more examples that bring it right up to the present. [First] the Afghan operation: from 1979 to the present, the CIA's largest operation anywhere in the world, was to support the Afghan resistance forces fighting the Soviet occupation in their country. The CIA worked through Pakistan military intelligence and worked with the Afghan guerilla groups who were close to Pakistan military intelligence.

In 1979 Pakistan had a small localized opium trade and produced no heroin whatsoever. Yet by 1981, according to U.S. Attorney General William French Smith, Pakistan had emerged as the world's leading supplier of heroin. It became the supplier of 60% of U.S. heroin supply and it captured a comparable section of the European market. In Pakistan itself the results were even more disastrous.

In 1979 Pakistan had no heroin addicts, in 1980 Pakistan had 5,000 heroin addicts, and by 1985, according to official Pakistan government statistics, Pakistan had 1.2 million heroin addicts, the largest heroin addict population in the world.
McCoy Interview, 11/9/91

Military Misadventure: Present Situation

Counterintuitively, as their power wanes, empires often plunge into ill-advised military misadventures. This phenomenon is known among historians of empire as “micro-militarism” and seems to involve psychologically compensatory efforts to salve the sting of retreat or defeat by occupying new territories, however briefly and catastrophically. These operations, irrational even from an imperial point of view, often yield hemorrhaging expenditures or humiliating defeats that only accelerate the loss of power.

Embattled empires through the ages suffer an arrogance that drives them to plunge ever deeper into military misadventures until defeat becomes debacle. In 413 BCE, a weakened Athens sent 200 ships to be slaughtered in Sicily. In 1921, a dying imperial Spain dispatched 20,000 soldiers to be massacred by Berber guerrillas in Morocco.
McCoy Article, 1/8/11