Heroin exports went up after we invaded Afghanistan. It did not go down even 1%. The taliban increased production to fund their war effort and the western power did nothing to eradicate poppy crops aside from a token effort in the beginning. 85% of the worlds heroin comes from the afghan region.
Why Britain's pledge to end Afghanistan's deadly heroin trade has failed - Telegraph
How do you reconcile an increase in exports with a 12,000% increase in seizures?
Forbes Welcome
But if you can make that work, then it doesn't bode well for your argument that border security will fix this.