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Karl Scheele realized he could transform arsenious oxide into arsenious acid, which, when combined with zinc, produced arsine. This discovery led being able to detect arsenic poisoning. -
The recognition of fingerprint patterns was studied, but it wouldn't be applied to criminal investigations for decades later. -
The first documented case of law enforcement comparing bullets to catch a criminal. -
Rudolph Virchow, was one of the first to note the differences and unique characteristics of hair to identify someone. -
The use of crime scene photographs were extensively studied in an effort to detect clues and criminal profiling to catch Jack the Ripper. -
New chemical compounds were discovered to test for blood. -
Manufacturing data regarding various weapons was catalogued. -
The first American police crime lab was created. -
The first case to go to trial using DNA evidence.