Devised a test to find arsenic.
Found a more precise way to find small traces of arsenic.
Published an article on detection of poison and effects.
Polarized Microscope was invented.
Microscope that could detect sperm.
First time toxicological evidence was used in criminal trial.
First time use of presumptive test for blood.
introduced the Bertillon's System
Discovered ABO blood typing.
Case that ended anthropometry
Locard's Exchange Principle
First irst in the USA.