“The increase in imprisonment of drug law offenders, and of people whose offending is associated with their drug use, has contributed to the current problem of severely overcrowded prisons. And the costs of such imprisonment, to individuals, families and the taxpayer, have increased substantially in the last decade.
Treatment has strong and growing evidence that it is effective in meeting the needs of people who wish to reduce the damage caused by their drug dependence. It appears to be highly cost-effective, largely through its impact on the criminality of patients”
From The Analysis of Drug policy
Also look at The Prison Reform Trust and Transform Drugs Policy Foundation
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