Not that I've been able to locate. Although, here's some interesting images of concealed knives using infrared: https://www.semanticscholar.org/paper/Automatic

Not that I've been able to locate. Although, here's some interesting images of concealed knives using infrared: https://www.semanticscholar.org/paper/Automatic-detection-of-knives-in-infrared-images-Yuenyong-Hnoohom/723ddb8f601add4636053035082100f288c4c20d https://www.semanticscholar.org/paper/Automatic-detection-of... I imagine coupling this information with data from a small magnetometer might build a sharper composite image.