According to this National Law Journal account (subscriber-only), Justice Sotomayor has a program of unpaid internships that is “unique to Sotomayor among the nine justices.” Under this program, she “has had a series of interns working for her at the court for brief periods, from two to four months long.” A driver’s license is required for the position, as the listed responsibilities include “Run errands outside of the Courthouse.” Another duty is “Preparation of lunch and meals for the justice.”

I assume that Supreme Court justices are exempt from the federal laws governing unpaid internships, but it’s nonetheless noteworthy, I think, that, according to this webpage, ordinary employers “cannot use [unpaid] interns to do grocery shopping or run other personal errands.”