Good Cop, Bad Cop? How Do We Make Sure Afghan Police Officers Aren't Taliban?

Afghan policemen

From Slate:

A Taliban member who'd infiltrated the Afghan police force killed five British soldiers in Helmand Province Tuesday afternoon. A similar incident occurred last month when a policeman on patrol with U.S. troops opened fire on American soldiers, killing two. How does the United States make sure the Afghan policemen aren't really terrorists?

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My Comment: This is an uphill battle.