[qingcharles]

This is correct.

The main difference I've seen, though, is that private prisons will sell you a lot more stuff for your cell. They generally take a more measured approach to security risks and allow you to buy steel-stringed guitars and PlayStations because there is enormous profit in those. The public jails and prisons won't allow as much stuff like that as it makes their employees' lives a lot harder from a security perspective.