I was up Whitney a few days ago and noticed wag bags stashed/left everywhere, including one within a few feet of the pond/little lake at Trail Camp where most get a supply of water.

As for FS vs. PS staff handling human waste - I was in the Mt Shasta Ranger Station yesterday, and people were talking about their sore arms. When I inquired, was told staff had just rec'd Hep B shots to help guard against that strain while handling WAG bags. They use a home-grown version of WAG bags, unlike Whitney.