Can Cat Urine Comoflauge A Crime Scena?
What are the limitations of luminol?
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There is some disadvantages to using luminol on evidence. Luminol only lasts for approximately 30 seconds and can only be seen in a very dark room. Also, spraying luminol continuously on where you think there might be blood can damage can damage other evidence around it and make it unusable in the future.
What fluids does luminol detect?
A chemical called luminol (for the nerds, the IUPAC name is 5-Amino-2,3-dihydrophthalazine-1,4-dione) is frequently used to detect blood stains at a crime scene. Luminol associates with the hemoglobin in blood. Hydrogen peroxide is always required for this reaction.J
What are some examples of contamination that an investigator can introduce into the crime scene?
Scene personnel can deposit hairs, fibers or trace material from their clothing or destroy latent footwear or fingerprints. Footwear patterns can also be deposited by crime scene personnel or anyone entering the scene.
How does luminol show a positive result?
Hemoglobin, a protein found in blood, enhances the oxidation of luminol. When blood and luminol come into contact, the hemoglobin speeds up the oxidation of luminol and produces the chemiluminescence that indicates the presence of blood.
How does a luminol test work?
Luminol solution reacts with blood to produce light. The luminol solution contains both luminol (C8H7N3O2) and hydrogen peroxide (H2O2). The hydrogen peroxide reacts with the iron in blood to produce oxygen. This oxygen then reacts with the luminol, changing the structure of the molecule and temporarily adding energy.
What cleaning products do crime scene cleaners use?
Disinfectant Solutions – Such as bleach and peroxide. Industrial Strength Deodorizers – Come in many different types and may be used in a fogger machine. Ozone machines are often used to assist in deodorization of the area. Solvents – Enzyme solvents help to disinfect and re-liquefy dried blood.S