Study on the Morphological Analysis of Hair Cut Ends Using Scanning Electron Microscopy

This study utilized scanning electron microscopy (SEM) to analyze the morphological characteristics of hair cut by various methods. In forensic investigations, hair serves as crucial evidence. When the hair root is present, DNA analysis can be employed for individual identification. However, when hair is cut in the middle, DNA analysis becomes challenging, making the morphological analysis of cut marks an essential aspect of forensic examinations. In this study, hair samples were cut using various tools, including a scalpel, utility knife, and scissors. SEM images were then obtained, and the morphological differences between tool-cut hair and hair severed by tensile force were compared and analyzed. The results indicated that tool-cut hair exhibited distinct striation marks on the cross-section, with the cuticle layer shifting in the direction of tool insertion, leaving scratch-like marks. In contrast, hair that was forcibly pulled apart showed no tool marks and displayed an irregular fracture pattern. These findings contribute to the quantitative and qualitative assessment of hair cut marks in forensic investigations and provide fundamental data for expanding the application of morphological hair analysis in criminal cases.