It is well-documented that the U.S. government has – at least at some times in some parts of the world – protected drug operations.
(Big American banks also launder money for drug cartels. See this, this, this and this. Indeed, drug dealers kept the banking system afloat during the depths of the 2008 financial crisis. And the U.S. drug money laundering is continuing to this day.)
The U.S. military has openly said that it is protecting Afghani poppy fields