[Frank Ettin]

Essentially, the guns will need to be stored in a manner which reasonably assures that the felon can't get his hands on one -- e. g., in a locked safe to which he doesn't have the combination or can't get the key.

Let's see what courts have said about what constitutes unlawful possession:

1. See U.S. v. Barron-Rivera, 922 F.2d 549 (C.A.9 (Wash.), 1991) in which Barron-Rivera's conviction for being an alien in possession of a firearm was affirmed without him even having had to touch a gun. Barron-Rivera's claimed reversible error in that the government failed to prove the necessary intent.
   
   The court of appeal noted, at 551:

   ...Barron-Rivera argued that the gun was in his wife's residence at the time he re-entered the United States and moved back into that residence. Accepting that contention, the district court, nonetheless, found that Barron-Rivera's possession of the firearm was voluntary because he permitted the firearm to remain in the house after he acquired knowledge of its presence....

   In affirming the conviction, the court of appeal found, at 551 -- 552:

   ...In other words, by continuing to reside in the apartment in which the gun was located, he voluntarily and knowingly possessed the gun...

2. See, also, United States v. Huet, 665 F.3d 588 (3rd Cir., 2012), in which the gun a prohibited person was charged with illegally possessing was not secured against the prohibited person's access, supporting both the prohibited person's conviction for unlawful possession of a gun and the indictment of his cohabitant. From the opinion (at pg. 593, emphasis added):

   ...on June 6, 2008, a valid search warrant (the “search warrant”) was executed on the couple‟s Clarion County home. Agents seized an SKS, Interordnance M59/66 rifle (“SKS rifle”) from an upstairs bedroom.
   
   Although Huet is legally permitted to possess a firearm, Hall was convicted in 1999 of possessing an unregistered firearm, in violation of 26 U.S.C. § 5861(d), and is therefore prohibited from owning or possessing a firearm. After being informed of the raid, Huet allegedly told investigators that the guns in the house belonged to her and that it was not illegal for her to purchase weapons. Despite Huet‟s assertions that she alone possessed the SKS rifle, the Government sought and obtained an indictment charging Hall with illegal possession of the weapon, and Huet with aiding and abetting Hall‟s possession....

   So the gun Hall, a convicted felon, was indicted for unlawfully possessing, belonged to his cohabitant, Huet. It appears to have been undisputed that Huet could lawfully possess firearms. Nonetheless, she was indicted for aiding and abetting Hall's unlawful possession of gun because Huet's gun wasn't secured against access by Hall.