Discovered how to detect poison in someone's stomach
Marsh test which detects arsenic
Founder of Toxicology.
Handbook for Magistrate, police official, and military policemen. (Birth of Criminalistics)
First scientist to analyze blood types A, B, and O.
Released his book, Questioned documents
First police lab
Invented the mugshot. Created an ID system based on physical measurements.
Founded the McCrone Research Istitute