"We have always been at war with Eastasia." - Orwell, 1984
Honestly, I'll start believing we can keep drugs out of the country when we have successfully managed to keep drugs out of our prisons. If we can't keep illegal drugs from making their way into maximum-security lockboxes for hardcore perps, how do we expect to keep them from getting to the general public?
Great point... but if you want to see how America might look without making an effort, there are places in the world that make good examples.