In a Landmark Decision, Texas Forensic Science Commission Issues Moratorium on the Use of Bite Mark Evidence


Today the Texas Forensic Science Commission issued a landmark decision recommending a moratorium on the use of bite mark evidence in future criminal prosecutions in Texas until the technique can be scientifically validated.  The Commission also and ordered a review of every conviction in Texas where the unreliable forensic technique was used.  The decision was in response to a request by the Innocence Project to investigate the forensic practice that has contributed to at least 24 wrongful convictions or indictments.

“For far too long courts have permitted this incredibly persuasive evidence that is cloaked in science, when in fact there has been no scientific research to substantiate the practitioners’ claims that it is possible to identify someone from a bite mark,” said M. Chris Fabricant, Director of Strategic Litigation for the Innocence Project, which is affiliated with Cardozo School of Law.  “By recommending a moratorium on further use of this unscientific evidence in Texas prosecutions, the Texas Forensic Science Commission has taken a giant step in purging unscientific and unreliable bite mark evidence from court rooms nationwide.”

Before reaching its decision, the Commission conducted six-month investigation and a held day-long  hearing in November where it heard from experts on all sides of the debate.  During the hearing, it was revealed that Dr. Adam Freeman, the president-elect of the American Board of Forensic Odontologist (ABFO), and Dr. Iain Pretty conducted a study of board certified forensic dentists where they asked to analyze photographs of 100 injuries, and in most cases, the practitioners were unable agree on which injuries were even bite marks.

Despite the fact that for decades courts have permitted forensic dentists to testify in criminal trials, there is a complete lack of scientific support for claims that a suspect can be identified from an injury on a victim’s skin.  This was noted in the National Academy of Science’s groundbreaking 2009 report,

Strengthening Forensic Science in the United States: A Path Forward

, which found, “no evidence of an existing scientific basis for identifying an individual [through bite mark comparison] to the exclusion of all others.”  Unlike the National Academy of Sciences’s report, however, the Commission specifically found that bite mark evidence should not be admitted as evidence.

In addition to recommending a moratorium barring prosecutors from using bite mark analysis in future prosecutions, the Commission ordered a review of past cases where the forensic practice was used.   The Commission will appoint a panel of experts, including forensic dentists, to review transcripts of the cases.  The American Board of Forensic Odontology pledged to help identify these convictions and stated that there are nine ABFO members practicing in Texas who will assist in this process.

The Innocence Project urged the Commission to investigate the use of bite mark analysis on behalf of Steven Mark Chaney.  After a thorough investigation by the Dallas District Attorney’s Conviction Integrity Unity, Chaney was released in October after wrongly serving 28 years for the murder of John Sweek based on the discredited testimony of two forensic dentists.  The case is now before the Texas Court of Criminal Appeals, which must review the uncontested findings of the lower court reversing Chaney’s conviction.  In addition to the Innocence Project, Chaney is represented by Julie Lesser, exoneration attorney of the Dallas Public Defender’s Office and the Southern Methodist University Innocence Clinic.


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Bernadette Feazell December 27, 2018 at 7:56 pm Reply   

This morning I awoke to the news of ACTUAL INNOCENCE for Steven Mark Chaney! I am so happy for Mr. Chaney, my thanks to Mr. Kris Fabricant and the rest of the IPOA for your work on getting rid of bite mark evidence. I am also happy because I know that Mr. Chaney has opened the door for others, I live in Waco, Texas. Mr. Chaney, the Innocence Project of America, and the TEXAS FORENSICS COMMISSION, are to be commended and cheered by every American. I have seen on many cases stemming from bite mark evidence from both sides of the aisle, I “drank the kool aid”, Homer Campbell, now deceased Forensic Dentist was quite convincing. I can recall his riveting testimony as though it were yesterday in the murders of three teens at Lake Waco. I have waited for this OPINION and celebrate this victory. Thank you.

Tanisha Adams December 20, 2018 at 3:20 pm Reply   

Thank you to the super hero’s at the innocence project for going above and beyond to help those individuals who would other wise just be judicial collateral damage. Without you, they would continue to lose their life, and even more quality time with family. Thank you guys for being Angel’s in a judicial system that is anything but blind and fair!

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