The USA has spent trillions of dollars trying to control drugs in the USA; and everyone from the bottom to the top can agree that it has been a failure. The number of people in prison is 150% more then what it was before all this began (this is by population %).
This brings me to what Portugal deals with drug use: they have decriminalized drugs. This is very surprising, but as of July 11, 2012 they have been doing it for 11 years. The amount of people addicted is down by 60%. For more details look it up http://en.wikipedia.org/wiki/Drug_policy_of_Portugal