They don’t… I’m guessing you might have done time in a state prison?
In the feds you can request any approved religious texts you want. Typically the chapel will have said materials available for consumption.
Also most prisons will have large Muslim and Hebrew Israelite populations.
I went from Atlanta Georgia to Detroit Michigan once. It was supposed to be 14 hours. It was 28. I didn’t sleep at all during the trip and crashed for half the day afterwards.
I vowed never to take Greyhound long distance again and never did.