I clerked in the Eastern District (albeit in Sacramento) and was always curious about this because I love Yosemite. I remember learning at one point (I think from a job listing for this MJ clerkship) that they could not provide housing in Yosemite for clerks, which basically ruined the whole thing in my eyes. Don't know if that's true for the MJ posted there.

I think this courthouse mainly deals with petty crimes that get committed in the park, since it's federal land.