

This is why perceiving individuals age based on the sound of their voice is inherently flawed. So when Zodiac researchers use the interpretations of earwitnesses and eyewitnesses to argue their case for a suspect (or person of interest) fitting the desired age range, they employ confirmation bias and augment the attributes of some and not others. The testimony of Bryan Hartnell, Donald Fouke, Michael Mageau and the three teenagers, regarding the age of the Zodiac Killer, will be dissected meticulously to discredit and promote each that best fashions a case for their person of interest. Interpreting information to conform to an existing belief system, while ignoring information that doesn't conform to an existing belief system, is highly beneficial in crafting a false narrative and magnifying the likelihood an individual will be perceived as the Zodiac Killer by the reader. The problem is that everybody does it, but it's only recognizable in others.