"Although no amount of policy analysis can resolve disagreements about how much punishment drug offenses deserve, research does make clear that some strategies for reducing drug use and crime are more effective than others and that imprisonment ranks near the bottom of that list. And surveys have found strong public support for changing how states and the federal government respond to drug crimes.
"Putting more drug-law violators behind bars for longer periods of time has generated enormous costs for taxpayers, but it has not yielded a convincing public safety return on those investments. Instead, more imprisonment for drug offenders has meant limited funds are siphoned away from programs, practices, and policies that have been proved to reduce drug use and crime."
More Imprisonment Does Not Reduce State Drug Problems: Data show no relationship between prison terms and drug misuse. The Pew Charitable Trusts. March 2018.