Crime Scene Investigator Network

Crime Scene Investigator Network Newsletter

APRIL 2021

Fingerprints — A True Science?

Gary W. Jones

As most in the fingerprint community are aware, the very foundation of fingerprint identification was challenged in 1999 in United States v. Byron C. Mitchell, Criminal No. 96-00407. It was alleged that the defendant Mitchell's fingerprint was found on the getaway car used in an armored car robbery. This case was significant in that it was the first challenge as to the validity of fingerprint identification in light of the standards for expert testimony as set forth in the 1993 United States Supreme Court decision in Daubert v. Merrill Dow Pharmaceuticals, 509 U. S. 579, 588 (1993) in which the court discussed four basic factors in regard to scientific testimony: (1) Testing (2) Peer review (3) Error rates and (4) Acceptability in the relevant scientific community. Trial judges were also given the responsibility of being gatekeepers to bar junk science from entering the courtroom.

This case resulted in a "Daubert Hearing" to determine the validity of the defendant's claim that there was no scientific basis for the assertion of individuality in the matching of fingerprints and that therefore the fingerprint identification from the getaway car was scientifically invalid. The government presented a number of fingerprint experts and scientists to argue for the scientific validity of fingerprints. On September 13, 1999, after hearing from both the Government and defense witnesses, the Honorable J. Curtis Joyner of the United States District Court for the Eastern District of Pennsylvania upheld the admissibility of fingerprint evidence and rejected the challenge by the defense attorney to exclude that evidence.

Most importantly, the court took judicial notice of two factors:

  1. Human friction ridges are unique and permanent throughout the area of friction ridge skin including small ridge areas.

  2. Human friction ridge skin arrangements are unique and permanent.

The court did not take judicial notice of the third requested factor: Individualization, that is, a positive identification can result from comparisons of friction ridge skin or impressions containing a sufficient quality (clarity) and quantity of unique friction ridge detail. The court ruled that this is an issue for the jury to decide. The fingerprint science is valid, but that does not preclude the defense from presenting expert testimony challenging a particular identification—which is the way it has always been.

The Daubert court cited Federal Rules of Evidence 702 which permits scientific testimony by witnesses who are qualified by knowledge, skill, experience, training or education. It also requires evaluation of the expert's qualifications, the scientific validity of the expert's field of knowledge and the conformation of the expert's testimony to the specific issue in the trial before testimony is allowed.

Consequently, issues such as error rate, knowledge of accepted methodology, and use of accepted methodology are important to being able to present testimony as an expert.

The science of fingerprints meets the standards set forth in Daubert:

  • Testing. The reliability of fingerprint analysis can and has been tested over an extended period of time. There has never been an instance in which two different individuals have been found to possess the same fingerprint.

  • Error Rates. There is much ongoing debate about this issue and probably will be for some time to come. I maintain that there is no error rate for the methodology of fingerprint analysis, however there is practitioner error. There are erroneous identifications, but those are not the fault of the science of fingerprints. The analogy most often given is, No science is more precise than mathematics, however that does not prevent the practitioner of math from saying that two plus two equals five. That is not the fault of mathematics, but the fault of the mathematician. The same thought applies to the science of fingerprints.

  • Peer Review. Few forensic disciplines have been subjected to more published material than fingerprints and these publications are open to peer review by others in the scientific community.

  • Acceptability in the Relevant Scientific Community. The reliability of fingerprint analysis has been accepted in the scientific community for almost a hundred years.

To present latent print testimony in court, a witness must qualify as an expert on the basis of knowledge (fingerprint science and related matters), skill (comparing friction ridge prints), expertise (in fingerprints and related work), training (how to do the job and it related matters), or education (formal courses in the fingerprint science and sciences in general). The witness must also be able demonstrate to the court that ...

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The information presented in this article is from the book Courtroom Testimony for the Fingerprint Expert, 2nd Edition © 2007 by Gary W. Jones

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The beginning of this manual is a list of processes and procedures for different surface types. Also included are processing sequences that specifically involve prints that are left in blood. Following these lists are details for each process that is currently implemented in the Latent Print Unit (LPU) of the Federal Bureau of Investigation (FBI) Laboratory.

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