They were like a million miles from anywhere down in the desert between San Diego and Tucson iirc. It was well over 100 degrees, summer 1939 and there was no AC in the '38 Ford Tudor. They would have disturbed a possible scene that needed to be investigated if they had drug the smelly bugger into the back seat of the Ford and driven 2 hours to the sherrif. They did exactly the right thing, notifying authorities ASAP after the photo. It's not my favorite Weston photo by a long stretch.