Four-Band LED Uniform Light Flashlight (Multispectral Physical Evidence Investigation Light Source) - Application Introduction in Criminal Investigation Technology and Forensic Identification
The Four-Band LED Uniform Light Flashlight (Multispectral Physical Evidence Investigation Light Source) is a core optical evidence-collecting equipment specialized in the fields of criminal scene investigation and forensic identification. Integrating four independent bands of white light, red light, green light and blue light, it relies on the principles of color separation photography and photoluminescence to enhance the contrast between potential traces and the background and excite the fluorescence effect of physical evidence in a non-destructive manner. It solves the pain point that traditional light sources are difficult to detect faint and potential physical evidence, provides accurate optical support for the discovery, identification, recording and subsequent identification of trace physical evidence, and ensures the scientificity and objectivity of forensic identification conclusions.
The core performance of the equipment is accurately adapted to the needs of criminal investigation and forensic identification: the four independent bands can be switched to target different physical evidence inspection scenarios—blue light excites the fluorescence of latent fingerprints, white light ensures clear recording, and red and green lights assist in distinguishing trace physical evidence; the light spot uniformity of ≥85% avoids light interference, ensures consistent physical evidence inspection results, and conforms to the rigorous requirements of forensic identification; the portable and lightweight design is suitable for both on-site investigation and laboratory inspection scenarios, and its long battery life and high stability can meet the needs of high-intensity evidence collection, providing convenient and reliable technical support for front-line criminal investigation and identification personnel.
Combined with criminal investigation practice and forensic identification cases, its application value is prominent: Case 1, in the on-site investigation of a burglary case, no obvious fingerprints were found on smooth surfaces such as walls and glass. With the blue light mode of this equipment, the fluorescence of latent fingerprints treated with fluorescent powder was excited, and complete fingerprints were clearly displayed and accurately recorded, providing key physical evidence for suspect identification and fingerprint comparison in forensic identification. Case 2, in the identification of a document fraud case, the equipment's multi-band switching was used to display blurred handwriting that had been altered or scraped on the document, distinguish the writing order of different inks, and suppress background interference through the red light mode to fix tampering traces, providing strong technical basis for determining the authenticity of documents and characterizing the case in forensic identification.
In summary, this equipment is widely used in scenarios such as the search for latent fingerprints, biological stains and trace physical evidence at criminal scenes, as well as laboratory document inspection and forensic trauma inspection. It can efficiently discover various faint and potential physical evidence, realize non-destructive evidence collection, standardize the investigation and identification process, improve the accuracy of physical evidence extraction and inspection, and provide objective and reliable technical support for forensic identification. It is an indispensable professional optical evidence-collecting equipment in the fields of criminal investigation technology and forensic identification.