The 84-year-old disappearance of Nancy Guthrie from her house in Tucson has reached a critical phase, and investigators are intensifying their research, leveraging advanced forensic devices to identify a suspect.
Genetic genealogy has been among the most closely watched techniques, an approach that has been rapidly developed over the years and has aided in solving intricate criminal cases over the last few years.
Police have reported thatDNA evidence taken during the inquiry, such as samples that were discovered on items surrounding Guthrie's property have yet to match any known offenders in the national criminal databases. This has led authorities to review how the analysis of genealogical DNA can potentially be a breakthrough.
Investigators have confirmed that the DNA retained through the probe is not yet a match with any known offenders in federal databases. Specifically, the CODIS, which has millions of profiles of offenders, did not find any matches with the DNA of a glove found near the crime scene.
An unfamiliar trail is not an indication of the loss of the trail. Rather, it singles out a major drawback of the traditional DNA databases: they merely store profiles of persons who were already arrested or convicted of some offence. In the case of a suspect who is never entered into the system, the investigators will depend on other ways of identifying the suspect.
This is where genetic genealogy comes into play.
Genetic genealogy is a crime-solving method that incorporates DNA testing with studies on family trees. Instead of merely looking to find a perfect match, at a crime scene, a DNA profile is compared by investigators to genetic data of public or consumer genealogy databases to find possible relatives of an unknown suspect.
According to experts, even remote family members can give crucial clues. The mapping of the family linkage and narrowing down the potential suspects will help the team to locate suspects that the investigators would not have known otherwise.
As per case reports, police are now considering this technique in the ongoing investigation.
One of the experts informedABC Newsthat, in the case of failure by other investigative leads, the other knows that the technique of investigative genetic genealogy will unearth the actual perpetrator, confirming the increasing confidence among forensic professionals in the technique.
Source: International Business Times UK
