7 janv. 1931 - Luminol and Blood Detection Kits: The use of chemical tests to detect trace evidence like blood developed over many decades. A simple, reliable prototype for police use (the polygraph) was developed around this time, and later chemical advancements like luminol built on this chemical-based evidence detection.
Ajouté au bande de temps:
Date:
7 janv. 1931
Maintenaint
~ Il y a 94 ans