The assertions about the involvement of the president’s brother in the incidents were never investigated, according to American and Afghan officials, even though allegations that he has benefited from narcotics trafficking have circulated widely in Afghanistan.
…
Several American investigators said senior officials at the D.E.A. and the office of the Director of National Intelligence complained to them that the White House favored a hands-off approach toward Ahmed Wali Karzai because of the political delicacy of the matter. But White House officials dispute that, instead citing limited D.E.A. resources in Kandahar and southern Afghanistan and the absence of political will in the Afghan government to go after major drug suspects as the reasons for the lack of an inquiry. [NYT [9]]
The whole thing reeks and this "limited resources" excuse sounds dubious at best. Ahmed Wali Karzai is chief of the Kandahar Provincial Council. If he’s a drug trafficker, that’s kind of a big deal, isn’t it? Our inability/unwillingness to even explore such a possibility just shows once again that our supply reduction efforts in Afghanistan are a total joke.