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The officer should be criminally charged especially considering that a child found it."
Do any one of us want this standard applied to ourselves if we make this mistake? I doubt it. Just like having an ND, some say its not a matter of if, but when it will happen to you. No matter how good, how competent, how responsible you believe yourself to be, you can make a mistake. Criminal charges should be applied to intentional criminal actions, not mistakes. No one should lose their livelihood and have an abrupt end to a long and honorable career because of a mistake. I would hope, that LE would have the same compassion for legally armed civilians, although I don't count on it. Guys do it often enough, and as John Farnum pointed out during a class, armed women have to deal with this issue every time thy visit the ladies room.
"Judge not, lest ye be judged".
And I'll bet the kid who safely and responsibly turned the gun in, may have been taught what to do by one of those evil NRA programs like Eddie Eagle.