He now serves as the head of the office of National Drug Control Policy.

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However the head of the US Office of National Drug Control Policy, John Walters, insisted it was working.

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Mr Werner was previously the head of the US Treasury's Office of Foreign Assets Control, the agency responsible for enforcing the US sanctions on countries, including Iran.

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Bob Werner was previously the head of the US Treasury's Office of Foreign Assets Control (OFAC) - the agency responsible for enforcing the US sanctions on countries including Iran.

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