Two hundred and fifty years in, the American justice system is still being built. Over its decades of work across the country, the Crime and Justice Institute (CJI) has supported the ongoing building and rebuilding of systems alongside dedicated policymakers, practitioners, researchers, and stakeholders working to improve outcomes in their communities. While no two systems face the same challenges, all of them experience the stages of iterative improvement. Policy windows open and close. The implementation gap is planned for and pursued, or it isn’t. Evidence accumulates and either informs the next policy window or doesn’t.
This historical milestone raises a question for system leaders: what are your most pressing or persisting challenges?
Once those challenges are identified, locating them within the cycle of justice system change is where the work of improvement begins.
The Justice System Cycle and Its Stages
At any given moment, a justice system is operating in all three stages at once. Understanding which stage a specific challenge is in is what makes it possible to invest in the right work at the right moment.
- The Policy Window. Justice system challenges are identified, political conditions align, legislative activity accelerates, laws change. This is the stage the field pays most attention to — it’s visible, time-bounded, and produces something concrete.
- The Implementation Gap. What a law says and what actually gets built on the ground are rarely the same thing. Resources don’t follow intent at the same speed. Systems adapt unevenly. The people inside the system — those working in it and those moving through it — absorb the impact of disconnected policy and practice.
- Evidence Development. Data emerges on what’s actually happening — who is being served, at what cost, with what outcomes. When that evidence reaches decision-makers at the right moment, it informs the next policy window. When it doesn’t, reactive decision-making fills the gap and the pattern repeats without correction.
The cycle is ongoing, and most systems invest heavily in one stage at the expense of the other two.
Three States, Three Stages
What this looks like in practice varies by state and policy area, but the cycle is consistent.
In Utah, a decade of data on the state’s 2015 sentencing law shows what actually determines long-term outcomes. Results depended less on the law itself and more on how policies were implemented, resourced, and adapted within an evolving justice system. The policy window opened and closed. What happened next in the implementation gap–adaptation, and sustained resourcing–is what shaped the outcomes.
Michigan is in a different stage. The evidence has accumulated. Restrictive sentencing policies are driving the state’s prison population upward even as crime rates remain steady, with average minimum terms rising 30% over the past decade. The evidence exist but the policy window has not yet responded to it.
Mississippi shows what the implementation gap looks like when it persists. Despite a decade of changes and declining crime rates, Mississippi has the highest incarceration rate in the nation, 60% higher than the national average. Policy passed, but the implementation gap remains.
And nationally, evidence is accumulating whether decision-makers are tracking it or not. Average time served in state prisons increased 13% between 2000 and 2018 across states under varied sentencing structures. The population of people age 55 or older in state prisons increased 47% between 2013 and 2023. These are not the product of any single policy decision, but of a pattern that has been running without sufficient course correction.
148 Years of Justice System Change
CJI is a division of Community Resources for Justice (CRJ), a nonprofit advancing reentry, disability services, behavioral health, and justice policy for safer communities. When CRJ began operating in 1878, Utah and North Dakota were not yet states. Today, CJI works across the country, from states navigating active policy windows to those still working through the implementation gap to those where evidence is only beginning to accumulate.
CRJ has worked inside justice systems across 148 years of change — long enough to have seen the pattern the cycle describes play out across multiple generations of policy. Its direct service divisions — Reentry Services, Community Strategies, and Behavioral Health — work alongside people at every point in the justice system. CJI supports that work, and the work of partners across the country, by tracking what the evidence shows, informing partners as they make their next decision, and connecting analysis to the implementation work that determines whether policy intent becomes operational reality.
That continuity between direct service and rigorous analysis reflects what real justice outcomes require: engagement across the full cycle, not just at a single point of intervention.
What the Work Requires
The hardest part of justice system change isn’t passing a law. It’s what comes after — making sure the right people have the right information at the right time.
When evidence doesn’t reach decision-makers, or reaches them and goes unused, policy is driven by politics and anecdote rather than on what’s actually working. Problems persist, the same debates resurface, and the people working in the system and those moving through the system absorb the impact. Taxpayers absorb the cost to public budgets and public safety.
Which stage is your system’s most pressing challenge in right now, and is the evidence from the other stages reaching the people who need it?
At 250 Years
The work continues. CRJ delivers direct services, operates programs, and works alongside people at every point in the justice system. CJI analyzes the evidence, informs the decisions, and helps systems move through the cycle more effectively. Together, the goal is to make sure that work happens before the next decision gets made without it.
Related: Mississippi by the Numbers | Policy to Practice: Ten Years of HB348 in Utah | Staying too Long: Michigan’s Prison Population and Sentencing Trends | Time Served is Rising Across States
Transforming Justice Systems, Together: