R. Austin Freeman, John Thorndyke's Cases — A Message from the Deep Sea (1909)
“ Not a grain of dust should be moved, not a soul should be allowed to approach it, until the scientific observer has seen everything in situ and absolutely undisturbed. No tramplings of excited constables, no rummaging by detectives, no scrambling to and fro of bloodhounds. Consider what would have happened in this case if we had arrived a few hours later. The corpse would have been in the mortuary, the hair in the sergeant's pocket, the bed rummaged and the sand scattered abroad, the candle probably removed, and the stairs covered with fresh tracks. ”
