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About DNA Forensics


DNA technologies have radically reshaped the role of forensics in police work. Even small amounts of blood, saliva, or other biological materials left at a crime scene can now lead to the identification or elimination of a suspect. Genetic evidence has been used both to convict perpetrators and to exonerate people who were wrongfully convicted on less reliable evidence, including scores of people on death row.

DNA typing is typically quite accurate when used to tell whether an unknown sample matches another sample that has already been identified. This is not to say that this process is without problems; simple human error, sample contamination, and misinterpretations have been known to skew results.

The development of forensic DNA databases--in which hundreds of thousands of profiles are stored with the intention of catching recidivists--has given rise to new sets of problems such as miscalculations of the statistical probability that an unknown sample coincidentally matches a stored profile. In some cases, what are touted as rare "one-in-a-million" odds of being a coincidental match are actually significantly more likely once other relevant factors (such as database size) are taken into consideration. Such information has, on occasion, not been revealed to juries.

Nevertheless, the compilation of DNA databases has been increasing dramatically. In many jurisdictions, both in the US and abroad (especially in the UK), they now include people who may have been arrested for but never convicted of a crime. This raises privacy issues in addition to issues of racial discrimination since minorities have disproportionately higher contact with police and are therefore overrepresented in these databases.


Minor crimes could land your DNA in N.J. databaseby S.P. SullivanNJJanuary 20th, 2016Gov. Chris Christie signed a bill to expand the State Police DNA database by requiring DNA samples for "disorderly persons" offenses upon conviction.
Unlocking the DNA of Doubtby Dane Halpin & Nanchanok WongsamuthBangkok Post [Thailand]January 10th, 2016An international forensics expert has serious concerns about the science behind claims of a '100% match' in the Koh Tao murder case.
New 'revolutionary' DNA test a potential game-changer for prosecutorsby Ken KolkerWOODDecember 23rd, 2015A defense attorney expresses concern as Michigan courts and police import a new computer program that claims to analyze previously unusable mixed DNA evidence.
Biopolitical News of 2015by Elliot Hosman, Pete Shanks & Marcy Darnovsky, Biopolitical TimesDecember 22nd, 2015We highlight 2015’s breaking news stories about human biotech developments.
It is Ridiculously Hard for Californians to get their DNA out of the FBI’s Genetic Databaseby Kashmir HillFusionDecember 18th, 2015More states should make DNA expungement automatic. People shouldn’t forfeit their genetic rights simply because of an arrest.
Florida Police Used a Smidgen of DNA to try to Fully Reconstruct an Alleged Criminal's Faceby Erin BrodwinBusiness InsiderDecember 2nd, 2015Parabon Nanolabs recently analyzed some remnants of DNA from a crime scene — not for fingerprints, but to create a digital likeness of the alleged criminal's face.
Can Biometrics Solve the Refugee Debate?by Katie WorthPBS FrontlineDecember 2nd, 2015The U.S. ramps up Rapid DNA sequencing for use in refugee immigration decisions, while the UN has been deploying iris scanners since 2013, both practices threatening human rights.
British police face deluge of foreign DNA requests if UK joins EU crime database, says reportby David BarrettThe TelegraphNovember 8th, 2015Officials warn that innocent Britons could be branded criminals if the UK joins a controversial EU project.
As Companies Collect More Health Data, Cops Will Ask To See It[cites CGS' Elliot Hosman]by Stephanie M. LeeBuzzfeedNovember 5th, 2015Law enforcement will request what users share with health technology companies, from DNA to step counts. The nature and number of those requests are largely unknown.
Genetic Surveillance: Consumer Genomics and DNA Forensicsby Elliot Hosman, Biopolitical TimesOctober 29th, 2015As more biotech companies move to “cash in on the genome,” we need to connect the conversations on personal genomics, DNA forensics, immigration, and biological discrimination.
Forensic DNA Evidence Is Not Infallibleby Cynthia M. CaleNatureOctober 28th, 2015Improved understandings of secondary DNA transfer raise questions about the accuracy of DNA analysis and subsequent criminal convictions.
Cops Want To Look At 23andMe Customers’ DNAby Stephanie M. LeeBuzzFeedOctober 21st, 2015The FBI and other agencies have asked for — and been denied — five users’ data, according to a new transparency report on the company's website, and chain of custody could be a legal obstacle for future requests.
What's Your DNA Worth? The Scramble to Cash In On The Genome[cites CGS' Marcy Darnovsky]by Alex LashXconomyOctober 20th, 2015Vast pools of genomic data may unlock health secrets, but what is the risk of "sharing" our data for biotech corporate profits, and is it greater than the nebulous future rewards?
For Some Refugees, Safe Haven Now Depends on a DNA Testby Katie WorthPBS FrontlineOctober 19th, 2015The US is requiring refugees to prove they're related through a DNA test — often impossible to obtain in war-torn countries — causing worries about an unreasonably narrow genetic definition of family.
Could Having Your DNA Tested Land You in Court?by Claire MaldarelliPopular ScienceOctober 16th, 2015Police in Idaho accused a man of an unsolved murder via partial DNA matching based on DNA records obtained from Ancestry.com.
Handheld DNA reader revolutionary and democratising, say scientistsby Ian SampleThe GuardianOctober 15th, 2015The $1,000 device is not designed to read human genomes, but it can quickly identify bacteria and viruses, and spot different gene variants in sections of human genetic code.
Ancestry.com is talking to the FDA about using DNA to estimate people's risk of diseaseby Arielle Duhaime-RossThe VergeOctober 12th, 2015After the FDA regulated 23andMe, another big player in the personal genomics business who has focused on genetic ancestry is looking to merge into providing lucrative health information.
'Great Pause' Among Prosecutors As DNA Proves Fallibleby Martin KasteNPROctober 9th, 2015The revelation that Texas labs have been using outdated protocols to analyze mixed DNA samples has led to concerns about thousands of criminal cases.
DNA At the Fringes: Twins, Chimerism, and Synthetic DNAby Erin E. MurphyThe Daily BeastOctober 7th, 2015DNA tests are thought to be conclusive, but our genetic material acts in mysterious ways. Chimerism, for example, may "undermine the very basis of the forensic DNA system."
Advances in DNA Testing Could Put Thousands of Texas Cases in Legal Limboby Meagan FlynnHouston PressOctober 5th, 2015Problems with analyses of testing with mixed DNA samples has cast doubt on many DNA-based criminal convictions in Texas.
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