End of story. There is no other reason that cops enforce drug laws. The Drug Czars may have the goal of ridding the country of drugs, but cops know better. They know it will never happen. But they like the policy, because it makes them rich.
Cops are just high school bullies who become adults.
If we must have the War on Drugs, then I think we should be consistent with punishment. And since tons of cops not only take the money they steal from dealers, but actually use their product, they should be punished, too. And I think we should model this punishment on China s policy for dealing with official corruption. We should execute every single person who works for the government and uses drugs. They must be purged to keep the State pure.