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During the ongoing Green River investigation, Gary Ridgway provided a DNA sample as part of routine suspect screening. At the time, forensic technology was not advanced enough to link the sample conclusively to the crimes. This moment would later prove critical when advancements in DNA testing allowed investigators to revisit the evidence.
Not applicable. This entry reflects forensic evidence collection.
Investigators collected samples from numerous suspects. While Ridgway remained on the radar, there was insufficient evidence to charge him at the time. The case gradually went cold in the following years.