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Proceedings Paper

Development of new near-infrared and leuco-dye optical systems for forensic and crime fighting applications
Author(s): Gabor Patonay; Lucjan Strekowski; Jozef Salon; Martial Medou-Ovono; James John Krutak; Jeffrey Leggitt; Heather Seubert; Rhonda Craig
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Paper Abstract

New chemistry for leuco fluorescin and leuco rhodamine for latent bloodstain and fingerprint detection has been developed in our laboratories. The use of these leuco dyes results in excellent contrast for several hours. The FBI's Evidence Response Team and DNA I unit collaborated with Georgia State University to validate the new fluorescin chemistry for use in the field. In addition, several new NIR dyes have been developed in our laboratories that can be used to detect different chemical residues, e.g., pepper spray, latent fingerprint, latent blood, metal ions, or other trace evidence during crime scene investigations. Proof of principle experiments showed that NIR dyes reacting with such residues can be activated with appropriately filtered semiconductor lasers and LEDs to emit NIR fluorescence that can be observed using optimally filtered night vision intensifiers or pocket scopes, digital cameras, CCD and CMOS cameras, or other NIR detection systems. The main advantage of NIR detection is that the color of the background has very little influence on detection and that there are very few materials that would interfere by exhibiting NIR fluorescence. The use of pocket scopes permits sensitive and convenient detection. Once the residues are located, digital images of the fluorescence can be recorded and samples obtained for further analyses. NIR dyes do not interfere with subsequent follow-up or confirmation methods such as DNA or LC/MS analysis. Near-infrared absorbing dyes will be summarized along with detection mechanisms.

Paper Details

Date Published: 16 December 2004
PDF: 10 pages
Proc. SPIE 5616, Optics and Photonics for Counterterrorism and Crime Fighting, (16 December 2004); doi: 10.1117/12.567855
Show Author Affiliations
Gabor Patonay, Georgia State Univ. (United States)
Lucjan Strekowski, Georgia State Univ. (United States)
Jozef Salon, Georgia State Univ. (United States)
Martial Medou-Ovono, Georgia State Univ. (United States)
James John Krutak, Federal Bureau of Investigation (United States)
Jeffrey Leggitt, Federal Bureau of Investigation (United States)
Heather Seubert, Federal Bureau of Investigation (United States)
Rhonda Craig, Federal Bureau of Investigation (United States)

Published in SPIE Proceedings Vol. 5616:
Optics and Photonics for Counterterrorism and Crime Fighting
Tim P. Donaldson; Colin Lewis, Editor(s)

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