In 2001, Portugal began a remarkable policy experiment, decriminalizing all drugs, including cocaine and heroin. Some predicted disastrous results—that drug addiction rates would soar and the country would become a haven for "drug tourists." Now that several years have passed, policy experts can study the results. In a new paper for the Cato Institute, attorney and author Glenn Greenwald closely examines the Portugal experiment and concludes that the doomsayers were wrong. There is now a widespread consensus in Portugal that decriminalization has been a success.