The source provides an extensive examination of five historical, unidentified serial killers in the United States whose cases remain unsolved, highlighting how these predators exploited societal vulnerabilities to operate with impunity. It outlines the terrifying methods and victim profiles associated with figures such as the Freeway Phantom in Washington, D.C., and the Doodler in San Francisco, emphasizing that the victims were often marginalized individuals ignored by law enforcement due to racial bias or homophobia. The episode also details the lack of closure for families affected by the New Bedford Highway Killer, the West Mesa Bone Collector, and the I-70 Killer, noting how the widespread use of highways and rural areas facilitated the killers' escape. Finally, the article concludes by discussing modern investigative techniques like DNA testing and genetic genealogy being used in the enduring quest to identify these criminals.
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