I work in a correctional center for males but not in the federal system in the state system. The usual day is kinda of dependant on where exactly you work, usually you count the controlled drugs, count the syringes, needles, and tools that are locked up, and then start pouring your meds for the day. Do some sick call ( see the inmates who have put in a request to see the nurse or doc for a medical complaint) they have to see the nurse before seeing the doc. After that go dispense meds either at a pill window or go to the building with a correctional officer. After that sign out your meds, eat some lunch if your lucky and help the doc see pt's and handle emergencies throughout the day and by that time it's time to count again the needles, tools and controled substances with the oncoming shift. That is about it in a nut shell for like day shift.
Hope this helps, I've always heard that the Federal Gov. pays a lot more but I'm not the one to travel to far to where I want to work:)