Background While the broader medical community grapples with the widely accepted notion that it takes an average of 17 years for research evidence to be incorporated into clinical practice, the implementation of evidence-based interventions in carceral settings (i.e., jails and prisons) faces longer delays, exacerbating health disparities. Main body The “prison implementation penalty” describes the significant delay in and limited adoption of evidence-based healthcare practices in carceral settings. We explore the complex challenges of implementing evidence-based interventions in jails and prisons, environments where healthcare often plays a secondary role under security and discipline. We use specific frameworks to highlight the unique barriers within these settings and propose potential implementation strategies. These challenges have broad implications for health equity due to the disproportionate impact on the marginalized groups affected by mass incarceration. Implementation scien