I'm not sure what they meant by "leave your conscience at the door" If they mean that you have to ignore the fact that some of your patients will have committed rape, murder, child abuse, etc, yeah, you do have to put that out of your mind. (We actually aren't allowed to look up what the inmates are in for, so that we aren't influenced by their crimes.)
As for overtime, where I am it's almost always available, but rarely mandated. (Mostly because my DON and ADON refuse to have a nurses' meeting with the topic "How to say 'No' to Kim and Tracey." I really need that meeting!)
Also, my DON and ADON often pick up the slack, doing med pass, working in Intake or the Infirmary, etc. (And the fact that they do this is one of the reasons that it's so hard to say no when they ask if you can pick up an extra shift.)
(Have I mentioned that I have the greatest DON (and ADON) on the planet?)
Anyhow, I work in a county jail. Our inmates sometimes get sentenced to state facilities, some are waiting for the feds to come and get them, and a few are waiting for INS.
All facilities are a little different. We have an agency nurse right now who worked at a jail in Atlanta (I think) and there are differences between how they did things and how we do things.
All in all, I love my job. It's never boring, and usually entertaining.