Safety catches do not always prevent firearm accidents and even newfangled biometric guns, which check the identity of a user by their fingerprint, cannot stop thieves from using stolen ammunition in other weapons.

The way to make firearms really safe, says Hebert Meyerle of Germany, is to password-protect the ammunition itself.

Meyerle is patenting a design for a modified cartridge that would be fired by a burst of high-frequency radio energy. But the energy would only ignite the charge if a solid-state switch within the cartridge had been activated. This would only happen if a password entered into the gun using a tiny keypad matched one stored in the cartridge.


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