Crime Scene Application
Ideally, any fluorescence crime scene examination, including vehicles and cadavers should be
sequentially conducted using: (1) visible light; (2) long wavelength ultraviolet; and (3) laser or alternative light source, such as Luma-Lite. If ultraviolet is your only fluorescence option, the likelihood of success is
diminished due to the narrower spectral search "window" of ultraviolet and its much lower power output, compared to laser or Luma-Lite.
The area should be darkened with the operator and others present wearing appropriate protective apparel. Many organic compounds, including human physiological fluids (semen, saliva, urine) will absorb light in the ultraviolet and fluoresce in the visible spectrum. Blood will not fluoresce but will appear darker under ultraviolet, making it more detectable. The advent of DNA tracing makes the recovery of such evidence, including hair (if root attached), of particular importance.
Other types of physical evidence that may fluoresce are fingerprints, footwear impressions and clothing fibers.
After the initial scan of the crime scene, Redwop fluorescent fingerprint powder may be applied. Redwop fluoresceses a bright
orange under ultraviolet. Wear dust mask and gloves. Photograph Redwop impressions using a Kodak 2A clear filter over camera lens and expose according to light meter. Lift using black lifters. All physical evidence detected should be photographed prior to removal.
http://www.rcmp-grc.gc.ca/fsis-ssji/firs-srij/bulletins/ultraviolet-eng.htm
