Guns and actors

[funkychinaman]

I've been sitting on this one for awhile: how do we determine gun usage for actors? For example, if an actor fires a gun, or holds it on someone, then it obviously counts. Same with someone picking it and examining it. And I'm told if it's in a holster. How about if someone passes the gun to someone? Or if someone grabs the gun in a struggle? Are we talking just "in control of" the gun? What about if a cop picks up a gun as evidence?