In March 1699, Quaker heiress Sarah Stout was found floating in a mill dam near Hertford, England. Suspicion immediately fell on Spencer Cowper, a married barrister who had spent the evening at her home. Facing execution for murder, Cowper found himself at the center of one of history's strangest forensic battles.
The prosecution relied heavily on a dubious scientific premise: they argued that a person who drowns while alive swallows massive amounts of water, causing the body to sink. Therefore, because Stout's body was found floating at the surface, they claimed she must have been strangled first and thrown into the river as a corpse. To support this, the prosecution brought forward sailors and local observers who swore that drowned victims always went straight to the bottom.
Cowper, defending his own life, assembled a formidable team of medical heavyweights, including prominent physician Sir Samuel Garth. The defense systematically dismantled the prosecution's claims, presenting anatomical evidence to prove that water does not freely fill the lungs or stomach in vast quantities during drowning. They demonstrated that whether a body floats or sinks depends on clothing, trapped air, body composition, and post-mortem gas build-up, rather than whether the victim was alive when entering the water.
This courtroom spectacle became one of the earliest high-profile battles over expert medical testimony in legal history. Persuaded by the defense's rigorous scientific arguments and the total lack of physical marks on Stout's body, the jury acquitted Cowper. The trial helped dismantle centuries of maritime folklore and paved the way for modern forensic pathology.