![]() ![]() A fragment from a magneto-optical sensor, originally developed for medical purposes, reveals an obliterated serial number on a gun when viewed through a polarized filter. His work is key to an NIJsupported research project to determine whether a new system that combines magnetic fields, polarized light and a special sensor is better than the traditional methods for recovering and reading obliterated serial numbers. In the firearms section of the Johnson County Sheriff’s Office Criminalistics Laboratory, located southwest of Kansas City, Kansas, firearms expert Jason Butell has spent many hours over the past two years destroying serial numbers on firearms and then trying to recover and read them. ![]() Magneto-Optical Sensors Bring Obliterated Serial Numbers Back to LifeĪ sensor technology first developed for medical use is being adapted to detect and visualize destroyed serial numbers in firearms. ![]()
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