The podcast episodes provided demonstrate the crucial role of evidence collection and analysis in criminal investigations.

In A Killer in Plain Sight | Blood is Thicker: The Hargan Family Killings | Part 3, detectives gather and analyze gunshot residue, phone records, and bank calls to build a case against the prime suspect, Megan Hargan.

Similarly, Episode 567: Fred & Rose West (Part 4) highlights the challenges faced by investigators in collecting and analyzing evidence, such as the interference from the serial killers Fred and Rose West, and the difficulty in identifying victims.

The episode Wild Crime: A Suspect | S2 Ep. 2 discusses the circumstantial evidence, such as beer cans and a jacket found at the suspected Yosemite crime scene, and the lack of a victim identification, which left the case unresolved despite a later skull discovery nearby.