Why is there such a discrepancy in the model and prison populations?

Learning Goal: I’m working on a law multi-part question and need an explanation and answer to help me learn.
Point of view is done as a retired correctional officer .
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Week 3- What correctional models are prohibiting a decrease in prison populations and should the model change to ease overcrowding?
Include the following aspects in the assignment:
Speaking from your persona, (retired correctional officer) what are your thoughts on the correctional model? Is it outdated?
Why is there such a discrepancy in the model and prison populations?
Remain in character as you go through and think about prison populations.