Forensic Light Sources for Detection of Biological Evidences in Crime Scene Investigation: A Review

Identification of biological evidences, such as blood, semen, saliva and urine, are important for crime scene investigation. Forensic light sources have been used for detection of biological evidences, where this method is a simple, presumptive, non-destructive test and applicable for detecting most types of biological evidences. Biological evidences can be detected by forensic light source due to their natural characteristic, such as light absorption (blood) or fluorescence effect (semen, saliva and urine). Biological evidences on different materials would have different effect in detection, where materials with high absorbent or exhibit strong fluorescence would affect the detection of biological evidences. This paper reviews on the methods and limitation of detecting biological evidences by forensic light source and provide the recommendations for improving the detection techniques using forensic light source.

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