All along the Governor and State Attorney General have said the two should not be prosecuted and if they are and get convicted the Governor will issue a pardon.
And, what I'd read several months back was the at the pistol the wife had was a non-operating pistol used for props in court trials. It had been deactivated so that it could not fire. When the local prosecutor had the police raid the house and seize the two firearms the pistol was found to be "non-operational." When the police told the prosecutors office that the pistol wasn't a firearm in it's present state the prosecutors office told the police department to repair the gun to operating condition and then test it.
If that is indeed what happened then the prosecutors office and police tampered with evidence, not the couple the guns were confiscated from.