Here's my 2 cents :two cents:
I sort of remember my first interview with our DON and the actual interview was not very long. Maybe at that time there were not enough interested nurses to fill the opening for a med nurse and I was the only candidate interested in the job. With that being said, it's entirely possible that you are in a similar situation. The vacancy needs filled quickly and therefore the interview process is formal but short.
Anyway, I did like the fact that I was given a quick mini tour around the different areas for the medical staff. I recall visiting the infimary, the dentist area, the pharmacy, and the "clinic" area. These are considered restricted areas and the inmates must pass through a metal detector before enering the clinic or infirmary area. So, as a "guest" you are there simply because the medical part of the institution has a vacancy that they are obligated to fill.
I should probably mention that security is of the utmost concern. When you interview in a correctional facility - the point is to get in and get out. You are a "visitor" that doesn't really have "visiting" privilidges yet. You are interviewing and I think they "condense" the whole interview process so that you (as a "non certified" guest in the facility) will not be there too long. I'm not sure of this but perhaps it is possible that the "warden" or person in charge of the facility doles a certain amount of minutes they will accept for the interview process. If you are hired, then and only then will someone from the medical staff guide you through the orientation process.
In our particular facility, one cannot be given a "swipe" card that gives access to the building UNTIL they have gone through security training.
I hope I have explained the whole "security" thing and it eases your mind. You can't compare this type of interview to others because they simply are not the same. I wish you luck and perhaps you can post the outcome of this particular job search. I am curious to see if anybody else posts ideas about your interview and how interviews are handled at their particular correctional facility. Good luck!!!