Quote from National Institute of Justice,
"The goal of legalizing drugs is to bring them under effective legal control. If it were legal to produce and distribute drugs, legitimate businessmen would enter the business. There would be less need for violence and corruption since the industry would have access to the courts. And, instead of absorbing tax dollars as targets of expensive enforcement efforts, the drug sellers might begin to pay taxes. So, legalization might well solve the organized crime aspects of the drug trafficking problem. On average, drug use under legalization might not be as destructive to users and to society as under the current prohibition, because drugs would be less expensive, purer, and more conveniently available."