The overdoses were revealed in documents detailing how the Army investigated a total of 56 soldiers, including the eight who fell victim to overdoses, on suspicion of possessing, using or distributing heroin and other opiates.
At the same time, heroin use apparently is on the rise in the Army overall, as military statistics show that the number of soldiers testing positive for heroin has grown from 10 instances in fiscal year 2002 to 116 in fiscal year 2010.
Army officials didn't respond to repeated requests for comment on Saturday. But records from the service's Criminal Investigation Command, obtained by the conservative legal group Judicial Watch, provided glimpses into how soldiers bought drugs from Afghan juveniles, an Afghan interpreter and in one case, an employee of a Defense Department contractor, who was eventually fired.
The drug use is occurring in a country that is estimated to supply more than 90% of the world's opium, and the Taliban insurgency is believed to be stockpiling the drug to finance their activities, according to a 2009 U.N. study. While the records show some soldiers using heroin, much of the opiate abuse by U.S. soldiers in Afghanistan involves prescription drugs such Percocet, the Army documents show.
Judicial Watch obtained the documents under the Freedom of Information of Act and provided them . Spokesman Col. Gary Kolb of the International Security Assistance Force, the NATO-led command in Afghanistan, verified the documents to CNN on Saturday.