Detectives Just Used DNA to Solve a 1956 Double Homicide
I&#x27;ve personally followed Andrew Singer&#x27;s&#x2F;BODE&#x27;s work and have been present in his (and other forensic genealogists) presentations to the forensics community. I was literally in the audience 2 days ago for another of his. I am a professional Forensic Scientist who is specialized in DNA. My educational background is in biochemistry &amp; molecular genetics. Feel free to ask me anything.<p>There is a lot of misunderstandings in this thread so far. For one, on the idea that &quot;sperm does not automatically equal murder,&quot; is of course logically true. DNA evidence doesn&#x27;t equate that point, but it does suggest that there is a putative perpetrator who could be responsible for the crime. It&#x27;s not up to forensic scientists to decide who committed what crimes. We can tell that the person was &quot;there.&quot; It&#x27;s up to the detectives to argue&#x2F;figure out, and ultimately the judicial system to decide the outcome&#x2F;verdict.<p>She was raped and killed, who&#x27;s DNA was on the vaginal swab? Most likely the perpetrator.<p>Secondly, to suggest that modern DNA forensic science is questionable is farce. There have been major issues with interpretation in the past with non-accredited crime labs&#x2F;analysts&#x2F;methods&#x2F;persons making bogus conclusions, but these days, and for the last 15+ years, has just plain not happened. If there were unqualified interpretations they would be thrown out of the courthouse in a nanosecond.<p>The absoluteness of DNA mixture interpretations is getting better and better. Google &quot;probabilistic genotyping.&quot; A human can reasonably look at data and discern multiple DNA profiles up to a few people when it comes to certain limited mixtures. Prob. Gen. software can deconvolute up to about 10 distinct people in a DNA mixture. It&#x27;s basically brute force computing. I bring this up because some of the examples other&#x27;s posted here happened when such tech didn&#x27;t exist and bogus interpretations were going on.<p>As for the ethics point. I have met with many victims personally. Not one has ever not returned genuine overly emotional gratefulness of our efforts. Many brave victims become spokespeople and support for other victims. They tour my lab all the time in wonder. I can&#x27;t tell you how many cases we&#x27;ve solved. DNA evidence, investigations, then a line up, then &quot;that&#x27;s the one!&quot; happen all the time. These would have never happened without DNA evidence.