Many countries' economy supports large illegal industries. It's a positive thing for the local marketplace in a narrow economic sense. National economies such as this could collapse, but more importantly, so will the major, worldwide crime organizations. Because of the decreased crime rate, officers will focus on important issues such as homicide and domestic disputes. They will not worry about underground drug deals and dealer shoot-outs.
Many trials occur due to drug-related cases.
Although legalization solves many problems, it creates need for tighter governmental control of substance use. Laws and regulations need to be passed in order for legalization to be controlled. I'm not pro-drug. I'm against drugs. Don't do drugs.