My educational background before nursing was Legal Studies with an emphasis on criminal justice & criminal law and a postbac paralegal certificate. Corrections interested me from the start, but in nursing school
we were dissuaded from considering this as a new grad. yet, they have hired a few new nurses.
Apart from the job of nursing itself, I can imagine that the organization entails alot of training, paperwork, and bureaucracy in everyday matter such as simply getting into and away from work every day, being basically locked in yourself all day, etc. That might not be for everyone. Then depending on the level of security at your facility your patients could be pretty challenging.
Lots of people I went to school with simply said "no way" and had some pretty harsh attitudes toward prison populations and convicted criminals. They expressed fears and reservations about it. I would say to them that they should consider Women's facilities, or look for the minimum security facilities and apply to those places only.