My understanding from the language in the C&F application is that it required an affidavit from any place you did pro bono work that is legal in nature. It says:
A complete application consists of the application questionnaire, all required accompanying forms and supporting documentation, including two Affidavits of Good Moral Character, and Legal Employment Affidavits from every law-related position you have held, including paid or unpaid internships, summer associate positions, volunteer work in law school clinics or elsewhere
If you're still doubtful I'd try to call the departments or ask a C&F attorney.
That quote does make it sound like I should be getting two. But the instructions for the actual question say:
... law-related work-study employment, and law-related employment for academic credit only, including participation in law school clinics and externships, and work as a research assistant.
Just to help clarify my pro bono hours are cobbled together from very very very temporary positions. Like, VITA, where where I spent 8 hours ONE DAY helping people do their taxes. It would be totally ridiculous to consider that "employment." The U of W advice seems different and I agree with their two form interpretation but its for things much more like employment than I think I have.
My unpaid summer 1L job I definitely got a law-related affidavit. I'll make an attempt to call though and see if I get any answer. I'll report back!
Edit: Completely non-helpful. They "don't make those decisions and leave it to the applicant." I guess since I'm already sending these poor poor people forms they have to do, I can ask for employment ones too but those have to be notarized by them which adds more annoyance.