Crime fiction: Questioning Longstanding Forensic Identification

"There is not enough variation in skull shapes to make a positive ID."

 Forensic experts have long used the shape of a person's skull to make positive identifications of human remains. But those findings may now be called into question, since a new study from North Carolina State University shows that there is not enough variation in skull shapes to make a positive ID.

 "In a lot of cases, murder victims or the victims of disasters are from lower socioeconomic backgrounds and don't have extensive dental records we can use to make a match," says Dr. Ann Ross, a forensic expert and professor of anthropology at NC State who is senior author of a paper on the new study. "But those people may have been in car accidents or other incidents that led them to have their skulls X-rayed in emergency rooms or elsewhere. And those skull X-rays have often been used to make IDs. I've done it myself.

 "But now we've tried to validate this technique, and our research shows that the shape of the skull isn't enough to make a positive ID," Ross says.

 At issue is the "cranial vault outline (left)," not the "face" of the skull. The cranial vault outline is the profile of the skull when viewed from the side, running from just above the bridge of the nose to the point where the skull and neck meet.

 For the study, the researchers surveyed 106 members of the American Academy of Forensic Sciences. Survey participants were asked to evaluate 14 antemortem X-rays and five postmortem X-rays. Participants were then asked to match the 5 postmortem X-rays with the appropriate antemortem X-ray, effectively establishing a positive ID.

 But the researchers found that only 47 percent of the participants made accurate identifications on all five skulls. Participants who have Ph.D.s did slightly better, with 56 percent of them getting all five correct. 

 "This doesn't mean that cranial vault outlines aren't useful," says Ashley Maxwell, lead author of the paper and a former graduate student at NC State. "For example, outlines can be valuable if teeth or other features are missing or have been destroyed. But it does mean that cranial vault outlines shouldn't be given too much weight.

 "The more characteristics we can take into account, such as facial features and cranial vault outlines, the more accurate we can be," Maxwell says.
*  *  *  *  *




Story Source:  Ashley B. Maxwell, Ann H. Ross. A Radiographic Study on the Utility of Cranial Vault Outlines for Positive Identifications. Journal of Forensic Sciences, 2013

Comments

Post a Comment

Popular posts from this blog

An unexpected way to recover from a breakup

Image
Breaking up is truly hard to do. And recovery from a breakup can be even harder. Your friends may counsel you to put the whole thing out of your mind. But new research suggests that repeatedly reflecting on a break-up -- even through participation in a research study -- actually speeds emotional recovery. "Breakups are ubiquitous -- most adults have experienced at least one in their life -- and are typically very distressing," says Grace Larson of Northwestern University. After studying divorce and breakups for years using longitudinal, multi-method designs, Larson and her then-adviser David Sbarra of the University of Arizona wanted to study whether these research techniques on their own were affecting participants. One concern they had was that the studies could be harming participants, Larson says. "At first glance, it might seem like repeatedly reminding participants that they had just broken up -- and asking them to describe the breakup over and over --
Read more

Greek Bronze Age ended 100 years earlier than thought

Image
Source: www.shef.ac.uk The charred remains of Assiros Toumba in Greece. Writing historical fiction set in the Greek Bronze Age?  Or simply enjoy reading this genre'?  Here's a study you may find interesting. C onventional estimates for the collapse of the Aegean civilization may be incorrect by up to a century, according to new radiocarbon analyses. While historical chronologies traditionally place the end of the Greek Bronze Age at around 1025 BCE, this latest research suggests a date 70 to 100 years earlier. www.weather-forecast.com Archaeologists from the University of Birmingham selected 60 samples of animal bones, plant remains and building timbers, excavated at Assiros in northern Greece, to be radiocarbon dated and correlated with 95.4% accuracy using Bayesian statistical methodology at the University of Oxford and the Akademie der Wissenschaften Heidelberg, Germany. Researcher Dr Ken Wardle says, 'These new results tell a story that is totall
Read more

Mood Instability and Your Characters

Image
You're putting together a character who's mood simply bounces all over the place, happy one moment, in a fit of rage the next.  Researchers at King's College London note that this sort of mood instability is part of a number of mental health disorders.  So how do you structure the personality and behavior of a character like this?  Below is the King's College report, along with a brief description from mentalhealth.com, of typical behavior, sometimes in the extreme, of a person who is very emotionally unstable.  This is offered strictly as a guide for crafting character in fiction - and NOT for the amateur diagnosis of the state of someone's mental health.  That is always best left to trained professionals. Another note about emotionally unstable behavior:  as any parent will tell you, this is how adolescents and teen-agers often behave.  It's a normal part of growing up - but it is a matter of degree .  In the extreme, however, this behavior can be diag
Read more

How the lives of Georgian gaolbirds and highwaymen shaped modern Britain

Image
Writing historical fiction requires solid research of available materials and databases.  The key word here is available.   So news of a new publicly accessible database that allows an author to research a very interesting past era is priceless almost beyond words.   I expect some exciting fiction to come out of this announcement. Here's the story, with a link to the source in the attribution. *  *  *  *  * London Lives, a landmark project led by Professor Bob Shoemaker from the University of Sheffield and Professor Tim Hitchcock from the University of Sussex, has uncovered a mass of extraordinary new evidence which reveals how the lives of thousands of 18th-century poor and criminal Londoners helped shape modern Britain. Based on evidence made available in a publicly available database, the study sheds new light on the everyday lives of thieves, prostitutes, vagrants, highwaymen, con-men, paupers and jailbirds, revealing how their daily fight for survival led to t
Read more

Remember faces but not names? You got it wrong.

Image
Source:   Daily Excelsior So, you think you're good at remembering faces, but terrible with names? New research has revealed we are actually better at remembering names than faces The cringe-worthy experience of not being able to remember an acquaintance's name leads many of us to believe we are terrible with names. However, new research has revealed this intuition is misleading; we are actually better at remembering names than faces. With the Christmas party season fast approaching, there will be plenty of opportunity to re-live the familiar, and excruciatingly-awkward, social situation of not being able to remember an acquaintance's name. This cringe-worthy experience leads many of us to believe we are terrible at remembering names. However, new research has revealed this intuition is misleading; we are actually better at remembering names than faces. The authors of the study, from the University of York, suggest that when we castigate ourselves f
Read more