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Evidence re-examination: Technicians isolate any remaining DNA from preserved items using contamination-control procedures developed after 2010.
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Family-tree mapping: Investigators build genealogical trees, narrowing suspects by geography, age, and historical records. Once probable relatives are identified, police obtain a legal warrant for direct DNA comparison.
This process has already solved more than 500 violent crimes worldwide since 2018.
The Broader Impact on Cold-Case Justice
For victims’ families, such breakthroughs bring a mix of relief and renewed pain. Forensic genealogy can offer closure, but it also raises ethical questions about privacy and data use. Civil-liberties advocates continue to debate how far law enforcement should go in searching consumer DNA databases.
Dr. Michael Aranda, a policy researcher at the Brookings Institution, argues that transparency is essential: “These technologies must operate under strict oversight and informed consent. Yet their ability to bring justice decades later cannot be overstated.”
The Role of Persistence
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