Characterization of children's latent fingerprint residues by infrared microspectroscopy: forensic implications |
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Authors: | Williams Diane Keith Brown Corrie J Bruker Justine |
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Affiliation: | Federal Bureau of Investigation, Laboratory Division, 2501 Investigation Parkway, Quantico, VA 22135, United States. diane.williams@ic.fbi.gov |
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Abstract: | The chemistry of children's latent fingerprint residues was investigated as a function of time and temperature by non-destructive spectrochemical analysis. Latent fingerprints from children, ranging in age from 2 to 11 years, were deposited onto aluminum-coated glass slides and were analyzed by Fourier-Transform Infrared Microspectroscopy. The results revealed that there are three major classes of compounds present in children's latent fingerprints: carboxylic acid salts, proteins, and esters. By studying the changes in the fingerprint residues as a function of time and at elevated temperatures, we discovered that the salts in the fingerprint residues are stable relative to the esters. These findings have relevant forensic implications; by targeting the acid salts instead of the esters or proteins, children's latent fingerprints may be recovered after extended periods of time have elapsed. |
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