'It's just astounding': Genetic genealogy credited with helping solve cold cases

The arrest in the cold-case double-homicide of a B.C. couple has shonea spotlight on a new DNA technology that could help solveother cases.

The process, known as genetic genealogy, uses DNA testing to buildand expand a family tree in conjunction with traditional genealogical records, such as census and vital records.

The technologywasused in the arrest of the Golden State killer earlier this month and appears to be increasingly used in criminal investigations.

CeCe Mooreis thegenetic genealogist who helped authorities map and analyze the DNA evidence that resulted in the arrest Friday of William Earl Talbott II.

Talbott, 55,was arrested for the murders of Saanich, B.C.couple Jay Cook, 20, and Tanya Van Cuylenborg.18. They were last seen alive Nov. 18, 1987.

"I do hope we will be able to continue to do it because we can help so many families," Moore said on CBC'sAll Points West.

DNA file uploadedonline

Moore worked on the case withParabon Nanolabs, a Virgina-basedgenetics company.

The lab used a DNA sample collected from the crime scene in the 1987 Cook-Van Cuylenborg slayings.

It uploaded the data from that sampleto a free,open-sourcegenealogy website called GEDMatch, which helps people find relatives.

The lab compared its file withabout a million other peoplewho have uploaded their genetic data to the site.

Two close matches were found from people who married and produced only one son, Moore said.

Once genealogists made the connection, police acquired a DNA sample from a cup Talbott had used.

Moore said she's "highly confident" Talbott is the only suspect.

Ethical, privacy concerns

The technology is effective, but it's rife with ethical and privacy concerns.

People who upload their genetic data to GEDmatcharen't necessarily consenting to police combing through their information.

Moore said the widespread coverage in the Golden State Killer case means GEDmatchusers are likelier to know their information isn'tprivate.

Van Cuylenborg's brother, John, said supporting DNA databanks for police purposes should be vital for the general public.

"When you look at the greater good and the benefit to society, I certainly feel that the use of these databanks is entirely appropriate and should make our communities a safer place for everyone to live," he said.

With files from CBC's All Points Westand The Canadian Press