I'm more concerned with the 'on-purpose' discharges I've seen on YouTube. For instance, this (http://www.youtube.com/watch?v=4tuAhoTPXEk ) Unless you want to claim an officer drawing a gun and shooting a man on the ground in handcuffs was accidental. Negligent, maybe, but definitely not accidental.
Honestly, though? I think a badge is a horrible idea because 1) It reinforces the stereotype of gun owners as vigilantes, and 2) I would imagine that even LEO that are okay with (or at least not vocal against) OC would be put off by us running around with fake badges on.