What types of crime scenes require special lighting techniques?

Crime scenes involving biological fluids or stains that fluoresce require special lighting techniques because certain substances, such as blood or bodily fluids, can emit characteristic fluorescence when exposed to specific wavelengths of light, typically ultraviolet (UV) or alternative light sources. This phenomenon allows investigators to identify and document the presence of biological evidence that may not be perceptible under normal lighting conditions. The application of special lighting enhances the visibility of these fluids, making it easier for forensic teams to collect evidence without contamination and to establish connections between the crime scene and potential suspects or victims.

In contrast, other crime scenes, such as those involving noise disturbances, spent bullet casings, or digital evidence, do not rely on fluorescence for the identification and collection of evidence. Instead, these investigations typically utilize different techniques and tools that are not focused on special lighting methods. Thus, the need for special lighting techniques is particularly critical in crime scenes where biological evidence is suspected to be present.