"In 2007, there were 1,922 arrests for first-time marijuana possession in Rhode Island. In 2008, there were 584 incidents of incarceration for marijuana possession.1 Ending prohibition and eliminating these arrests would save the state approximately $12.7 million in criminal justice costs."

Source

Opendoors, "The Criminal Justice Costs of Marijuana Prohibition in Rhode Island," (Providence, RI: March 2010), p. 1.
http://realcostofprisons.org/…