The Smallest Minority on earth is the individual. Those who deny individual rights cannot claim to be defenders of minorities. - Ayn Rand
Brass, the ultimate deadly weapon.
They ought to charge and try every one of those people, plus anyone else who might have touched that piece of metal. And double -dog-dare anyone who looked sideways at them while they were doing it.
Or repeal this stupid, obscene, pointless, dangerous law that destroys the criminal justice system from inside.
Based on news reports, they do at least charge criminals for possession of a firearm without a license and possession of ammunition without a license in addition to whatever crime was committed.
I don't know of anyone who has been charged with possession of ammunition for empty brass, but I always warn unlicensed friends to check their clothes carefully before leaving the range.
The soldier was licensed to carry. I wonder if the charge could be aiding and abbetting a minor for handing him the brass.
The laws need to be revisited
Sounds to me like you should wash your hands, and perhaps your clothes, before leaving the range as well. A good lawyer would have no trouble defining powder residue as an "ammunition component."
I've heard of stupid gun laws, but the MA one is the most asinine that can be conceived.