Or, you can read the complete Cato Institute report HERE. Here is a quote from the summary at the beginning of the report:
decriminalization has had no adverse effect on drug usage rates in Portugal, which, in numerous categories, are now among the lowest in the EU, particularly when compared with states with stringent criminalization regimes. Although postdecriminalization usage rates have remained roughly the same or even decreased slightly when compared with other EU states, drug-related pathologies — such as sexually transmitted diseases and deaths due to drug usage — have decreased dramatically. Drug policy experts attribute those positive trends to the enhanced ability of the Portuguese government to offer treatment programs to its citizens — enhancements made possible, for numerous reasons, by decriminalization.
One weakness of this report is that it contains no data on the amounts of money spent by taxpayers under the current system as opposed to before decriminalization. It would be interesting to know if Portugal is getting these results and also spending less taxpayer money on drug issues, as one might guess.
I am not in agreement with the libertarians at the Cato Institute on too many issues, but when it comes to the war on drugs, these guys are right on the mark.