I was under the impression that constructive possession only applies to NFA items. In other words, it is not part of the AWB text.
Constructive possession can apply to a lot of things, not just NFA items. NFA is just more obvious because BATFE has laid down case law, issued rulings, etc...
Here's a good example...
A convicted felon lives with his girlfriend. His girlfriend is clean and she owns a revolver. If she leaves the revolver in an accessible location to the felon, and the police search the premises for whatever reason while the felon is there, and find her unsecured revolver on the premises, they may try to charge HIM with felon in possession, because he "constructively" possessed the gun- eg, he still had access to it. On the other hand, if she locks the gun up in a safe before she leaves the house, and only she has access, it would be incredibly difficult for the prosecution to show that he constructively possessed that revolver, because the presence of the safe has inserted another degree of separation.
A lot of whether CP will fly or not is based on other laws in court, case law, etc. If they try to get someone on CP with a weak case, the case will fail.
ETA, heres another fun example. Say a guy likes to play with chemicals as a hobby. Somehow mary hairnet finds out he has a lab in his basement, and then
they come and perform an unwarranted raid on his lab, etc. The prosecutor/DA still has to prove that the guy had intent to manufacture illegal substances or
devices... and if he can't do that "cleanly" in court, it's going to fail.
-Mike