Study of reliability of urine sample in forensic analysis.

Forensic investigations include identifications of body fluids that are found on the crime scene, urine is one of the common body fluids found at the scene of a crime. Identification of the urine stains done by various methods based on physical, chemical, and microscopic properties of the sample. Recent studies also include novel instrumental techniques that are non-destructive for urine stains. This study was conducted using qualitative research methods and experimental study of urine samples. Experiments were performed for the identification of urine at 3hr to 72 hr time intervals. The qualitative estimation was done through the physical test using UV light, Jaffe's chemical test for Creatinine, and nitric acid crystal test for microscopic examination of crystals present in the urine. The results of the conducted study show positive results in all the experiments or tests that are performed for analysis. UV test results show greenish-yellow fluorescence on all surfaces. Jaffe's test gives deep orange color as a positive result on all the surfaces. Microscopic examination shows various crystals that are present in urine. Abnormal urine crystals were observed in the study, are rare in common urine, and only present in the person with the Nephrotic disease. From the conducted study it was concluded that urine gives positive results in UV and Jaffe's test even after the period. Both types of surfaces absorbent and non-absorbent give positive results. Microscopic examination in the bright field microscopy shows best results for all urine samples of male, female, menstrual urine, and baby urine. [ABSTRACT FROM AUTHOR]