In the movie District 9, an alien race utilizes weaponry that samples the users DNA and will only operate when used by specified species. While fantastic, similar technology is entirely possible due to advances in biometrics, according to a Discover Magazine article.
Looking at other common technologies that have incorporated biometrics for security purposes lends credence to the possibility. Technologies including fingerprint scans, vascular scans, iris scans, voice recognition and face recognition have all seen huge steps forward in recent years in acceptance, use and capability. Utilizing these technologies to lock a weapon is entirely plausible with each of them as well.
The problem some see, however, is that no mode of biometrics has been developed to be foolproof enough to trust with securing deadly weapons. The hope for those involved in national governments and biometric security companies is to move towards a DNA-based solution once science is capable.
However, the last hurdle before getting to this point would be privacy advocates who are already fighting many of the biometric system implementation across the globe.
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