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Study raises questions about longstanding forensic identification technique

Tue, 12/10/2013 - 7:58am

This x-ray image shows the cranial vault outline of a skull. Image: Ashley MaxwellForensic 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 Univ. shows that there is not enough variation in skull shapes to make a positive identification.

“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 prof. 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,” 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 five postmortem x-rays with the appropriate antemortem x-ray, effectively establishing a positive ID.

But the researchers found that only 47% of the participants made accurate identifications on all five skulls. Participants who have graduate degrees did slightly better, with 56% 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.

The paper appears online in the Journal of Forensic Sciences.

Source: North Carolina State Univ.

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