In Switzerland, for example, they tried it in a park that quickly became known as needle park. They had to shut it down because it became a petri dish of scummy addicts, petty criminals and prostitutes. After that experience, the Swiss voted by 73 percent to reject drug legalization. If they had noted what a sewer Amsterdam turned into because of legalized drugs, they could have saved some hassles. Nobody ever gets arrested for admitting to past drug use, and most addicted criminals are criminals not for using drugs but for robbing or stealing to pay for them.
Serious addicts are simply afraid of admitting they're serious addicts.
It's humiliating to admit to a drug problem, but that's an inevitable byproduct of our society's reasonable effort to stigmatize drug use. Which is really the crux of the issue. More importantly, even if our drug laws don't do a great job discouraging drug users, they do have a hampering effect on drug dealers. Gaghan was a heroin and cocaine addict until his three primary dealers were arrested. My dealer, my backup dealer and my backup-backup dealer.