I have my own opinions about Sheriff Joe Arpaio and the whole (lack of) justice system in general.
Back in the early 80s, I was a deputy-sheriff in Texas. Got out of it because I could not bring myself to arrest people for consensual acts (drugs, etc).
That being said, back then the kitchen in the county jail was run by trustees and we had some pretty damn good food. That was way pre-primal for me and I enjoyed about everything they cooked.
As I understand it now, almost all the county jail food preparation is outsourced and premade meals are brought in. Likely done by the same company that premakes the food that is sold in schools.
That should tell you a bit about the quality.