It isn't that simple. Cops, screws, "rehab," and property siezure are all big business. Law enforcement in the U.S. is rotten to the core. It is no longer effective against non-drug crime. Even rape and murder solution rates are way below historic norms. This is a very very bad problem, and ending the Drug War will be just the first step to solving it.
There's an additional 2nd Amendment issue that goes along with the WOsD: How many kids are being force fed "mental health drugs" in school? This is another face of the Brady Beast, as once a person is prescribed any medications for mentla health reasons, they are no longer allowed to own firearms. Never.
So, right in our schools, they have removed the right to keep and bear arms from millions before they are ever old enough to own any firearms.
Additonally, the 2nd isn't the only victim of the WOsD. The 4th has taken a heavy toll as well. Not so heavily under president Bush, but 'toon was horrible with it. Notice that the DEA isn't this president's private hit squad, and the number as well as frequency of no knock search warrants has decreased (at least in the news).
Simple economics, and simple constitutional law show the WOsD to be a total failure. If you enact laws that drive the price of a product that is in demand, there will be people who step in to exploit that market. Unfortunately, the exploitation is on both sides of the law anymore. Lastly, there is no reason for us to pay for the warehousing of individuals arrested on first time drug busts for simple possession - that should be a financial penalty only. ($30,000 per year average incarceration costs US wide, for nearly 700,000 people during 'toons tenure. Out of just over 2,000,000 prisoners, almost 70% are behind bars for drugs. That's stupid.)
It amazes me that many people who call themselves "constitutional conservatives" support the WOD without question. The WOD cause many, many more problems than it solves.