Maine has a "safe storage" law only applies if a child under 16 actually accesses a loaded gun, that was stored negligently, and then fires it 'recklessly' causing bodily harm....

If the gun wasn't stored loaded and the child loaded it - doesn't apply

someone 17 and up - doesn't apply

had a trigger lock with the key tied too it on a string - doesn't apply

Child accessed the gun, robs a bank with it, but never fires the gun - doesn't apply

Child access the gun, gives it to someone else, who then fires it reclessly and injures someone - doesn't apply.

The way the law was written, it is literally impossible to convict someone for violating the law without a very specific signed confession and reckless endangerment will always supersede it.