It’ll create an interesting problem for cops. When they confront such a guy with one....they will want to confiscate it. But under what law do you take away a guy’s fake decoy gun? There is no such law.
Immediately, the cop will be on record....as the guy who took a fake gun, making him look awful foolish among his peers. Within weeks, he’ll be disturbed about this and likely seek mental health treatment.
Personally, I think it’ll make people start to think about the whole big picture.