In its report "A Tale of two Countries: Racially Targeted Arrests in the Era of Marijuana Reform," the ACLU points out that marijuana arrests continue to clog the criminal justice system even though there is broad support for legalization. And, 9 out of 10 marijuana arrests continue to be for simple possession.
Sometimes, the non-court consequences of criminal activity are as serious as the consequences of a conviction. These "collateral consequences," however, have traditionally come as the result of criminal prosecution. Most of the time, society doesn't inflict serious consequences on people who have never been convicted.