The Use of Alternative Light Source (Als) in ...

The Use of Alternative Light Source (Als) in Forensic Evidence Detection and it's Benefits in Police Investigation

Author Name : Veluru Likitha, Dr. Priyanka Singh

ABSTRACT : A vital component of criminal justice systems across the world, forensic investigation is the painstaking collection, preservation, examination, and interpretation of evidence in order to establish the truth and settle legal disputes. With the introduction of Alternative Light Sources (ALS), crime scenes and objects of interest have been selectively illuminated with particular light wavelengths, such as ultraviolet (UV) or infrared (IR) radiation. This causes materials to fluoresce or luminesce, making evidence that would otherwise be invisible to forensic examiners visible. ALS includes a range of imaging systems, including as multispectral, laser, blue, green, UV, IR, and others. These systems each have specific uses, such as identifying body fluids, latent fingerprints, and trace evidence. ALS outperforms conventional light sources in that it allows for the viewing of concealed evidence and increases contrast and visibility.Examples from real-world situations show how effective it is at locating latent fingerprints, analyzing bloodstain patterns, and detecting bodily fluids—all of which have led to successful prosecutions. Applications range from bloodstain and bodily fluid detection to crime scene documentation and trace evidence examination.