In 1914 which forensic pathologist succeeded for the first time in criminal history in scientifically detecting poison in the bones and body parts?

The Marsh Test

Legal Vindication of the Marsh Test

Because the arsenic in the Marsh test was separated from the forensic sample in the form of a gas, the complications that had plagued earlier precipitation tests were avoided and it soon became the definitive procedure for the forensic detection of arsenic. It was first employed in France during the 1840 trial of an attractive young widow by the name of Marie-Fortunée Lefarge, who was accused of poisoning her much older husband, Charles, with arsenic that she had allegedly purchased for the purpose of killing rats. The trial was closely followed by the French press, especially when several faulty attempts to detect arsenic in Charles' body using the new Marsh test proved negative, only to be subsequently overturned when repeated by the famous toxicologist, Mathieu Orfila, who had been originally hired as an expert witness by the defense! In the end Marie was found guilty and the Marsh test both legally and publicly vindicated.