It's a model that has continued to be used in the American justice system for centuries, but it's not a system based on any scientific principles. Worse, it doesn't actually work. As often as not prison breeds worse criminals rather than keeping people on the straight and narrow.
I don't think it's helpful to characterize the actions of officers or DAs as racist per se but rather to point to the racist consequences of drug laws, LEO behavior, and so on. I think the number of people within the system acting in good faith far outweigh the number of bad actors and if we desire change it'll be easier if we can convince such folks into coming to "our side" rather than vilifying them.
The California Correctional Officers union is routinely accused of pushing for harsher punishments as a job guarantee, which of course is a problem in a state with such over-crowding of its prisons like California. I would accuse them of gross moral indecency but it takes a pretty indecent person to become a CO anyways.
https://www.jacobinmag.com/2014/01/the-bad-kind-of-unionism/
Hearing the security procedures that goes into taking actual tools into a jail makes your realise how locked down they are - every single item (down to a set of keys) has to be inventoried on the way in, and on the way out. No phones taken in - no exceptions. Bear in mind that staff working on security systems never get in the same space as prisoners - it's not like they're fixing cameras in the cafeteria while the prisoners mill around.
As an aside, he is investigating the use of automated drones for doing perimeter patrols. They are good at flying a set pattern with a camera payload. But there are many kinks to work out.
Correctional facility is what they call them, yep.