Olfactory Signatures of Bladed Weapons: Characterization and Implications for Canine Detection

Knife crime has increased globally, yet the effectiveness of current detection methods used by law enforcement is often limited in operational settings. This challenge highlights the need for innovative detection approaches. The use of canines as highly mobile and sensitive biosensors for the detection of bladed objects may provide an effective and novel solution. A critical step toward implementing canine-based detection is the characterization of the odor signatures associated with bladed objects. Therefore, it is hypothesized that box cutter blades possess a distinct volatile organic compound (VOC) profile that can be differentiated from those of other common metal substrates. To test this hypothesis, headspace extraction and chemical analysis were conducted on box cutter blades of varying sizes, and their VOC profiles were compared with those of metal keys. Five compounds were consistently identified across blade samples and may be considered characteristic odorants of box cutter blades: decanal, eicosane, nonadecane, nonanal, and octadecane. The results suggest that box cutter blades possess detectable and distinguishable VOC profiles that are consistent across different blade sizes. These findings provide foundational data for future odor characterization studies and support the development of canine training aids and detection programs targeting bladed objects.