According to the office of the Special Inspector General for Afghanistan Reconstruction (SIGAR), which today announced it had sent the classified findings to lawmakers, Afghan officials are failing to stop sexual exploitation.
Primarily at issue is the entrenched custom of what is known in Afghanistan as "bacha bazi" -- or the sexual abuse of boys -- and whether the US is turning a blind eye.
"Afghan officials remain complicit, especially in the sexual exploitation and recruitment of children by Afghan security forces," SIGAR said in a quarterly publication that described the outline of the Congressional report.
"Victim-protection efforts remained inadequate, as all but one government-run shelter for trafficking victims remained closed during the reporting period," SIGAR said.
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Neither the Pentagon nor the Afghan government immediately responded to requests for comment.
Under US rules called the Leahy Laws, the Pentagon and the State Department are barred from providing assistance to any unit of a foreign nation's security forces if credible information exists that the unit has committed a gross violation of human rights.
Bacha bazi is not seen as homosexuality in Afghanistan, where gender segregation is rampant -- instead the possession of young boys decked out as pretty women symbolizes power and primacy.
President Ashraf Ghani this year laid out stringent penalties against bacha bazi for the first time in a revised penal code, but the government has given no timeframe over when they will be enforced.
The new rules came after AFP last year exposed how the Taliban exploit bacha bazi to infiltrate security ranks.