How Forensic Genealogy Solved the Rachel Morin Case

Forensic Genealogy in Criminal Investigations

• 💡 Forensic investigative genetic genealogy is a method used to explore genetic data from crime scenes to identify potential perpetrators.
• 🎯 The process involves building family trees by going backward in time from an unknown DNA sample to identify the individual.
• 🔑 A crucial step is then confirming the identified individual by comparing their DNA to the original forensic profile.

DNA Evidence and Courtroom Challenges

• ⚠️ Prosecutors state that DNA evidence found at the crime scene and on the victim's body linked the defendant, Victor Antonio Martinez-Hernandez, to the case.
• ⚖️ The defense is questioning the DNA match, with claims that it is not 100% accurate for all samples.
• 🔬 Discrepancies in DNA match percentages can sometimes be due to incomplete amplification, low-level samples, or contamination, but multiple samples strengthen the evidence.

The Rise of Forensic Genealogy

• 🚀 Forensic investigative genetic genealogy was first used successfully in 2018 to identify the Golden State Killer.
• 📈 Since its inception, the tool has been embraced by criminal investigators across the U.S. and internationally.
• 📌 It is estimated that over 1,200 cases, primarily violent crimes like homicides and sexual assaults, have benefited from this investigative technique.
• 🚫 The use of this method is generally restricted to serious crimes and is also applied to cases involving unidentified human remains.