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Infrared Spectroscopic Imaging for Noninvasive Detection of Latent Fingerprints

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ABSTRACT:

The capability of Fourier transform infrared (FTIR) spectroscopic imaging to provide detailed images of unprocessed latent fingerprints while also preserving important trace evidence is demonstrated. Unprocessed fingerprints were developed on various porous and nonporous substrates. Data-processing methods used to extract the latent fingerprint ridge pattern from the background material included basic infrared spectroscopic band intensities, addition and subtraction of band intensity measurements, principal components analysis (PCA) and calculation of second derivative band intensities, as well as combinations of these various techniques. Additionally, trace evidence within the fingerprints was recovered and identified.
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Keywords: FTIR; forensic science; latent fingerprints; spectroscopic imaging; trace evidence

Document Type: Research Article

Affiliations: 1: Oak Ridge Institute for Science Education, FBI Laboratory, Counterterrorism and Forensic Science Research Unit, FBI Academy, Quantico, VA 22135. 2: FBI Laboratory, Counterterrorism and Forensic Science Research Unit, FBI Academy, Quantico, VA 22135. 3: Laboratory of Chemical Physics, NIDDK, National Institutes of Health, Bethesda, MD 20892-0520.

Publication date: January 1, 2007

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