So what did they do before DNA?
Most of my research around postmortems, pathology, and police procedures involved wading through the dozens of worthy books on the topics I picked up secondhand. Most do not make good reading, but all are packed with facts and clues on what would constitute a credible 1920’s investigation. The information on the following websites is far more accessible:
Forensic Pathologists in History
image courtesy of Wikimedia Commons