Development of new near-infrared and leuco-dye optical systems for forensic and crime fighting applications

Gabor Patonay; Lucjan Strekowski; Jozef Salon; Martial Medou-Ovono; James John Krutak; Jeffrey Leggitt; Heather Seubert; Rhonda Craig

doi:10.1117/12.567855

16 December 2004 Development of new near-infrared and leuco-dye optical systems for forensic and crime fighting applications

Gabor Patonay, Lucjan Strekowski, Jozef Salon, Martial Medou-Ovono, James John Krutak, Jeffrey Leggitt, Heather Seubert, Rhonda Craig

Author Affiliations +

Proceedings Volume 5616, Optics and Photonics for Counterterrorism and Crime Fighting; (2004) https://doi.org/10.1117/12.567855
Event: European Symposium on Optics and Photonics for Defence and Security, 2004, London, United Kingdom

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.

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Gabor Patonay, Lucjan Strekowski, Jozef Salon, Martial Medou-Ovono, James John Krutak, Jeffrey Leggitt, Heather Seubert, and Rhonda Craig "Development of new near-infrared and leuco-dye optical systems for forensic and crime fighting applications", Proc. SPIE 5616, Optics and Photonics for Counterterrorism and Crime Fighting, (16 December 2004); https://doi.org/10.1117/12.567855

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KEYWORDS

Near infrared

Luminescence

Blood

Pepper spray

Light sources

Forensic science

Chemistry

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