Application of multi-band light source in the crime scene investigation 1

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1. First searching: enter the crime scene, with the white light of multi-band wavelengths for the first investigation, the purpose is to explore if there is any footprints, fingerprints, hair, fiber, or glass pieces, etc. trace evidence, which is based on the material evidence of light scattering principle.
2. Second search: after the white light searching, it will be scene as possible shading, it will be better to search again, with blue and green light output of multi wave band light source, by wearing orange glasses for the second round of the crime scene investigation, because many suspicious substances will emit a inherent fluorescent, such as body fluids, fiber, fat and so on. If there is a dead body, using blue and green light on the body and clothes to check the semen stains, saliva, hair, fiber, scars or bite marks.