The US/Canada border is incredibly porous. There is so much area to cover, along with numerous communities that practically sit on top of the border, native res

The US/Canada border is incredibly porous. There is so much area to cover, along with numerous communities that practically sit on top of the border, native reservations, and bodies of water. Any attempt to seriously crack down on smuggling would be prohibitively expensive and politically unpalatable. 3d printing is advancing among enthusiasts, but when it comes to the black market, illegal importation from the US is still by far the easiest and cheapest option.