No design needed - the higher the interdiction rates, the higher the dealers' profit margins, so intrinsically the more the war on drugs succeeds the more it fails.
We have more overdose deaths, more wasted spending, more people in prison per capita than anywhere in the world.
A big fail for the people. A big win for drug cartels, money laundering banks, politicians, prisons and police state agencies.
As we know, government never lets a crisis go to waste.