The "F" word in drug policy

I've noted a few times the shift, sometimes subtle, that has been taking place with regard to drug policy. Hillary Clinton's speech in Mexico is yet another example. We would expect a reference to "shared responsibility," but how long has it been since a Secretary of State admitted a policy was failing? Even further, I wonder how many U.S. policy makers have said publicly that failures in U.S. policy have led to Mexican deaths.