They've appeared on the editorial page of the WSJ years ago and you can find them by doing web searches. They are certainly disputed and a large amount of subjective analysis is injected on both sides.
No offence intended, but do you also believe in the Sandman, Great Pumpkin, Easter bunny and Santa Claus?
No, but I also don't believe that laws, on balance, cause more people to commit crimes than they deter. If that's not true, than we need to change our entire legal system and not simply the War on Drugs.
Proof of their existance, in my opinion, is much more conclusive than is the evidence that any good thing has come from the war on drugs.
You don't believe that the war on drugs reduces drug use. Many people do. Convince them that they are wrong. Attacking their sanity and honor is not going to do that for you.