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It might misidentify a hostile target as friendly.It might misidentify a friendly target as a hostile.The issue here is that you’re introducing a couple of new ways for the weapon ti fail, no matter what weapon you are attaching this technology to, and intelligent soldiers do not like weapons that may fail to work. But even if you could, smart soldiers would not want to use it. ‘Just don’t be where the bullets are going’ approaches assume intelligent troops, which is not something you should rely on (there’s a long standing joke about ‘military intelligence’ being an oxymoron, but even ignoring that stereotype mistakes can and will be made), and can just as easily be exploited by intelligent enemies.īiological and chemical weapons have a nasty tendency to be completely indiscriminate and hard to defend against and there will generally be no way to perfectly protect your own troops (there is a reason that most of the smart militaries treated them as an absolute last resort even before they were banned by international treaty).Įven if you go really out-there sci-fi/fantasy and have omething that scans brain wave patterns, or looks at the target’s soul, or some other crazy evaluation of intrinsic properties of the target, there will probably be some way to spoof it (or some dangerous failure mode). IFF tagging (mentioned by a number of other answers) can be fooled or hijacked (this has actually been an issue multiple times in the recent past).Ī smart gun that only fires on identified foes can be hacked (and is still susceptible to the issues of IFF tagging). No matter what approach you take, there is some way to work around it or some dangerous failure path. But I never believed they could invent frangible rounds, so why not invent the opposite? Who knows, maybe DARPA is making these things right now. Obviously these rounds would take some very sensitive and advanced electronics not yet developed. Any bullet that gets close to an ally will deactivate, so you don't want to be winging near-miss rounds past friends. Against unarmored opponents, I'd guess these bullets would still be lethal, so watch out for hostages and other soft targets. The projectiles would still pack a wallop, but you won't be blowing holes in a co-worker. At extremely close range, the electromagnet may not be active yet (or alternatively, it may activate and not deactivate in time) so point-blank ranges may be unpredictable. So a bullet set to the RFID signal of your squad deactivates and is frangible against the armor of an ally. Firing the gun activates the electromagnet, while proximity to the RFID signal of an ally deactivates it. If the electromagnet is engaged, the projectile is held in an armor-piercing configuration designed to kill armored (or unarmored) opponents. Their guns contain bullets that are frangible if they hit an armored target - as long as the tiny internal electromagnet isn't engaged. Right before combat, everyone synchs a set of RFID transponders to the same frequency. I imagine a team of armored SWAT or special-forces troops. This isn't something invented yet, so it's a bit hypothetical. Out-there idea: Reverse-frangible bullets: But depending on the angle the person is the laser would not reflect 180 degrees back to the weapon. Third thought was some sort of laser that would reflect from a special material in the teams clothing, it would block the trigger while you are targeting a good person. Next thought was related to some sort of GPS coordinates or team radio triangulation do determine if a person is from the team or not, but GPS is not that precise and I could only find articles on mobile phone triangulation based on cell towers that a bad precision as well. But if the person is not directly facing the camera in the weapon or helmet it wouldn't work. Some sort of facial recognition would help but would need to work in milliseconds to lock the trigger and avoid the shot. In real life would it be possible to make a weapon (today or near future) that will never shoot someone from your own group? On some computer games it is common to have a setting that disables friendly fire, it does not prevent shooting but it the bullets don't harm friend players.