I never believed in ghosts (other than the Holy Ghost) until I read this article on ghost guns. I'd read of guns created with a 3D printer but never took it that serious. Was I wrong! Not only are police in Edmonton but throught Canada & the USA taking ghost guns seriously. It was about a decade ago that I first saw a 3d printer and now you can find plans for making ghost guns readily available online. Its no wonder police are concerned, not only in Edmonton but many other communities as well.