There's been a larger push for evidence-based medicine over the past decade or two. I'd love it if our criminal justice system was more evidence-based and focused solely on reducing crime/suffering/injustice and better rehabilitation. Many police departments fall into the trap of using number of arrests as their KPI, because that's easier to measure than outcomes.

Serial season 3 has had good discussion on minimum sentencing and judges who sentence based on whims, not on what's effective.