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First US murder conviction overturned using DNA, family tree evidence
WASHINGTON, July 18, 2019 (BSS/AFP) – An American man was exonerated
Wednesday for a decades-old murder he did not commit, using evidence based on
DNA and a genetic family tree, the first such result using a revolutionary
investigative technique.
Christopher Tapp, 43, had served 20 of his 30-year sentence for the 1996
rape and murder of Angie Dodge.
On Wednesday, a court in the state of Idaho completely overturned his
conviction based on evidence found with “genetic genealogy” — the technique
used to identify the suspected “Golden State Killer” by making DNA matches
with his distant relatives.
“It’s a new life, a new beginning, a new world for me, and I’m just gonna
enjoy every day,” Tapp said at the end of the hearing, local media reported.
Tapp’s exoneration came after police arrested another suspect, Brian
Dripps, in May. Dripps, who was identified using genetic genealogy, confessed
to the crime.
Genetic genealogy first made headlines in April 2018, after it was used to
find the alleged “Golden State Killer” in California who is blamed for 12
murders and more than 50 rapes dating back to the mid-1970s.
In that case — as well as about 70 others that have been solved since —
DNA found at crime scenes was compared to the databases for genealogy
websites.
The websites — widely advertised in the United States — allow users to
post DNA test results and then generate a list of people with similar
genomes, enabling users to find distant relatives.
The databases also allow police officers to search through people with
similar genetic profiles to DNA found at crime scenes. Tracing back through
family trees and seeing where the DNA crosses can lead investigators to a
suspect.
But Tapp’s case is the first in which genetic genealogy has been used to
prove innocence.
“It’s just such an incredible feeling to be a part of clearing an innocent
man’s name,” CeCe Moore, the genetic genealogist who worked on the case, said
in an interview with ABC.
The case against Tapp began to crumble before investigators started to use
genetic genealogy.
In 1998, Tapp was sentenced to 30 years in prison based solely on his
confession, which he then retracted.
In 2017, he was freed from prison in a court agreement, but the murder
charge was not dropped.
A year later, his defense team obtained the right to test sperm traces
found in Angie Dodge’s bedroom. Genetic genealogy led investigators to Brian
Dripps.
Dripps, who in 1996 lived just across the street from Dodge, confessed to
the crime after officers tested a cigarette butt he had thrown away against
the crime scene DNA.
The Idaho Bonneville County prosecutor withdrew the charges against Tapp
and filed a motion to exonerate him, which a judge endorsed on Wednesday.
BSS/AFP/MSY/0951 hrs