Which duty would gary perform in civil justice more often than what he does as a criminal forensic scientist?

I believe the answer is:. Handwriting analysis

Civil justice is an organization that provides a various form of supports in Legal procedure.

One of the things that members of this organization do is conducted handwriting analysis in order to determine whether a certain legal document is legitimate. (experts in handwriting analysis could determine whether it's written by relevant person or it's performed under certain pressures)