Decades of research point to the same conclusion: incarcerating people for problematic drug use does not address the underlying needs driving that use, and it frequently makes things worse. That’s the premise Proposition 47 was built on, and a decade of evidence shows it got the diagnosis right.
A Referral Isn’t a Cure
One frequent line of attack on Prop 47, the 2014 ballot measure that reclassified low-level drug possession and theft from felonies to misdemeanors, is that it led to fewer court-mandated treatment referrals. But this argument rests on a shaky premise: that a referral to treatment is the same thing as effective treatment.
A growing body of research casts real doubt on the effectiveness of compulsory treatment models. A 2016 systematic review that screened more than 400 studies down to the nine that met rigorous methodological standards found decidedly mixed results: some showed worse outcomes for people in compulsory treatment, some showed better, and the largest share showed no meaningful difference at all. Studies from Norway and Malaysia both found that people who entered treatment voluntarily were more likely to stay drug-free and slower to relapse than those who were compelled into care. A meta-analysis of drug court outcomes also found these programs tend to perform less effectively for people with the most serious substance use needs and for young people. These are precisely the groups who most need treatment to work.
Part of the problem is design. Researchers at the Social Science Research Council and Physicians for Human Rights have documented how courts often rely on a one-size-fits-all approach, funneling large numbers of people into the same program regardless of whether it matches their level of need. That means treatment beds fill up with people who didn’t need intensive care, while people with more serious dependence go underserved. Mandated programs also have little tolerance for relapse, even though relapse is a normal and expected part of recovery. When someone stumbles in a court-ordered program, the response is often jail time, not a second chance. And the coercive nature of mandated treatment itself gets in the way: people who feel forced into care report weaker relationships with their treatment providers, and that trust is often what makes treatment work in the first place.
Some studies indeed find mandated treatment reduces reoffending compared to doing nothing. But, as addiction physician Sarah Wakeman has pointed out, those comparisons usually measure mandated treatment against the old status quo, straight incarceration, not against the kind of voluntary, community-based care Prop 47 funds. Some favorable studies compare mandated participants, who tend to be lower-risk and easier to treat, against a general population with more severe needs, stacking the deck in favor of criminal justice system referrals. Prop 47 created a genuine third option beyond jail and compulsory treatment: voluntary services people can access without the threat of incarceration. That’s a fundamentally different and more effective model. Declining criminal justice referrals following Prop 47 suggest the state is relying less on a mechanism the evidence never fully supported.
Incarceration Compounds the Problem It Claims to Solve
The same jail-first logic that fails people with substance use disorders also fails people experiencing homelessness. Jail can make an unhoused person temporarily disappear from a street corner, but it does nothing to solve the underlying housing crisis, and it often makes a person’s situation worse. According to the Prison Policy Initiative, formerly incarcerated people are almost ten times more likely to be homeless than the general public, driven in large part by the barriers a criminal record creates: landlords and public housing authorities routinely screen out applicants with justice system involvement, while credit checks, security deposits, and reference requirements shut out people who’ve spent time away from the workforce. A 2023 research briefing reviewing more than 50 studies found that homelessness, substance use disorder, mental illness, and incarceration are deeply intertwined, each one compounding the others. Layer in the fact that incarceration itself worsens addiction and mental health. Overdose is the leading cause of death among people recently released from prison, overdose risk spikes sharply in the first two weeks after release, and people often increase their drug use in the year after release. The criminal justice system does nothing to break the connections between homelessness, addiction, and incarceration — it reinforces them.
The Data on Prop 47’s Investments Are Strong
Prop 47 took a different approach. Rather than continuing to cycle vulnerable Californians through jail, it redirected the state savings from a shrinking prison population into community-based treatment, housing, and mental health programs. That reinvestment has now reached nearly $1 billion, with 65 percent funding county mental health and substance use treatment, 25 percent supporting K‑12 programs, and 10 percent funding trauma recovery centers for crime survivors.
Prop 47’s grant programs have been rigorously studied and show impressive results. Grantees in the program’s first funding cohort reported recidivism rates under 23 percent, compared with California’s 35 percent statewide average. The second cohort, which was evaluated despite pandemic-era disruptions, achieved an average of just 15.3 percent. An earlier CJCJ analysis of the first cohort found that 12 of 13 grantees reduced recidivism relative to a comparison group of similar Californians who didn’t receive services, with some programs cutting reoffending to as little as a fifth or sixth of the comparison rate and avoiding an estimated 1,500 convictions.
Figure 1. Change in housing status from enrollment to program completion among Prop 47 participants*
The gains in housing and employment are just as striking: recent state data found that 34 percent of enrollees were unhoused and 71 percent unemployed when they entered a Prop 47 program, with only 2 percent working full time. Among participants who identified housing as a goal, the share who were unhoused fell from 34 percent at enrollment to 13 percent by program completion, while independent living nearly doubled, rising from 15 percent to 29 percent. Employment outcomes also improved. Unemployment rates among participants who wanted a job fell by more than 50 percent from 71 percent unemployed at program enrollment to 34 percent at program completion.
All of this comes at a fraction of the cost of incarceration: California spends roughly $131,100 a year to imprison someone, compared to about $3,770 per person served through a Prop 47 program, a nearly 35-to‑1 difference. Nearly 90 percent of Prop 47 funding supports mental health services, and close to 80 percent of grant dollars flow directly to the community-based nonprofits, which are often best positioned to provide services within the communities they serve. Altogether, these Prop 47-funded programs have served tens of thousands of Californians to date.
Figure 2. Change in employment status from enrollment to program completion among Prop 47 participants*
The Gap Is Funding, Not the Model
For all its success, Prop 47 has never come close to meeting the full scope of need across the state. Its programs currently reach select high-needs communities in roughly half of California’s counties, leaving large swaths of the state, and many millions of people, without access to these services. The funding stream, while substantial, was always going to fall short of the need in a state as large as California. Prop 47 proved the model works; the state has yet to give it the resources to scale statewide. That’s the real lesson of the past decade. Not that community investment failed, but that it hasn’t yet been tried at the scale the problem demands. That progress is now facing new pressure as recent policy changes have begun redirecting dollars away from these evaluated, effective programs and toward a renewed reliance on incarceration.
Prop 47 is not, as critics claim, a failure that is making homelessness and drug addiction worse. The evidence points the other way. It is measurably addressing both problems by reducing unhoused rates and unemployment among the people it serves and steering thousands away from the cycle of addiction, incarceration, and rearrest that jail alone never breaks. Its shortfall isn’t in what it does. It’s in how far it currently reaches.