This is one way to do it...

...right here. I don't know how many of the gun-runners are stupid enough to try to cross the border at official checkpoints with such illegal cargo, but if we had more people guarding the border that'd get to be a moot issue. I'd think it would be much easier to smuggle mass quantities of drugs north than it would be to smuggle mass quantities of guns south, but either way I don't see why Americans' rights should be infringed upon as any resort, much less a first one as so many people seem to advocate.