Awesome but impractical idea: require every laser over a certain wattage to encode in very short pulses its own serial number. On first purchase and every resal

Awesome but impractical idea: require every laser over a certain wattage to encode in very short pulses its own serial number. On first purchase and every resale, owners much register and transfer ownership. Now, whenever such an incident happens, a bit of footage is all you'll need to prosecute the owner. Shortcomings: cost of implementation, real or alleged theft, aftermarket modifications to mask the pulses, imported lasers, people who don't fear repercussions.