I would wager that right now, in the US, there are more people that know how to use CNC machines and have access to one than people who know how to use 3d printers and have access to one. Consider that damn near every mid-sized shop these days has a CNC machine, while 3d printers are still very much a hobbyist's toy (your regular Joe can always pop down to the local hackerspace to get access to one, but I doubt many hackerspaces would be amused at regular Joe printing out his own Liberator. I would expect to see more leeway given to people who work in shops with CNC machines though, mostly due to the lower visibility).

With any luck 3d printers will become more ubiquitous in the next few years, and this will all clearly be no longer the case.