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Urine contains a large amount of urea, a chemical byproduct of normal metabolic processes in the body. Identification of high levels of urea can therefore serve as a screening test for urine in fluids or stains. The presence of creatinine is also used for screening purposes. Creatinine forms a red compound with picric acid (known as the Jaffe Test). Urine also has a characteristic odor, which can help in locating its presence. Gentle heating of urine-stained materials gives rise to a distinctive odor.
Urine from secretors will contain ABH substances. This is a source of contamination in testing underclothing.
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- DNA – A Prosecutor’s Practice Notebook
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- Non-STR DNA Markers: SNPs, Y-STRs, LCN and mtDNA
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- Forensic DNA Education for Law Enforcement Decisionmakers
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- Law 101: Legal Guide for the Forensic Expert
- Laboratory Orientation and Testing of Body Fluids and Tissues
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