Can you add a Concentration after you've already graduated?

[Daithi]

I'm looking for something in Criminal Justice. I'm too old (mid 50s) to become a cop or anything like that, but I'm looking to do something I'd enjoy for the last 15 years or so of my working career. Entry level criminal justice jobs actually appeal to me at this point. I'm looking for something like insurance investigation, probation, PI, who knows.

I'm ex-Army (30 years ago), in good shape, and I've worked as a software developer for 30 years (so not an idiot). I think I just need something on the resume that shows I have an interest in the field to be taken seriously.