This reminds me of the story of the junky in the STL jail.
Had a crack head break his finger because he seriously thought they would take him to a hospital.
They did not.
Not that I doubt your story, but at least here if you get injured they usually release you if medical attention is required because they have to pay your medical bill as long as you are still in custody, I've actually seen this happen.
Not that you're going to get out of a murder or rape charge, but something like DUI/non support/vandalism, basically something silly and misdemeanor they let you go.