The best way to dispose of a rattlesnake is to cut off, and bury it's head.
Detach the head from the body. Because even after death, their teeth can still excrete venom. If the teeth or the venom break skin, the chances of survival decrease exponentially.
At 3:30am, on a road above the Columbia River, in Southern Washington, the road signs were set up on location, in the dark. They were placed on the edge of the road shoulder and the grasses, to avoid getting nipped by large vehicles.
At 7:00am, we wrapped our morning shot, returned to the signs to collapse and remove them, and were greeted by a stretched out rattlesnake at the base of the sign. Likely, it had been lurking in the grass adjacent to the sign, all morning. NO BIG DEAL.
The local sheriff who was overseeing traffic control, took out his knife, removed the head, and asked “Is it ok if I take it home? My kids will love it”. He buried the head, and dropped the snake into his brown paper lunch bag, and drove away with a smile on his face.