Generally, a person's criminal history is not going to legally bar them from working in certain industries (maybe certain positions , but not necessarily the industry); examples of exclusions include theft or fraud convictions & not working in the finance industry, or working with children and having a sex offender history.
I advise contacting the Ga Composite Medical Bd @ http://medicalboard.georgia.gov/license-certification-all-professions; or the Ga Bd of Nursing @ http://sos.georgia.gov/plb/rn/. I am sure either of those should be able to give you a good answer as to whether someone with your history may be permitted to be certified. At least in some instances, licensing boards have discretion, while in other instances they don't, so it is best to ask them and find out now. Good luck.