Trope-a-Day: Friendly Fireproof

Friendly Fireproof: Your modern weapons, seeing as they contain fairly sophisticated software and personal-area network integration, tend to come with FFI (Friendly Fire Inhibition) to ensure that this is realized in real life; they just plain won’t fire at targets positively identified as friendly.

(Yes, of course there’s an override mode.  There’s also a fancier civilian model that prevents you from firing if the collateral damage you might do exceeds the amount your tort insurer would be willing to pay for.)

Of course, all guarantees are off when it comes to grenades or other area-effect weaponry…

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