7 gen 1931 anni - 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.
Aggiunto al nastro di tempo:
Data:
7 gen 1931 anni
Adesso
~ 94 years ago