Canadian cannabis border issues. Canadians who work or invest in the cannabis industry, or use it are facing life bans at US border crossings. With Canada set to legalise cannabis on October 17, Customs and Border Protection (CBP) warning people it will not allow them into the US. CBP executive assistant commissioner for field operations Todd Owen said the US will not change is policies to accommodate the changing Canadian laws. Under Federal US law, cannabis is still illegal across the country although it is legal in some US states.