Can't be any more porous than borders in Asia. https://en.wikipedia.org/wiki/Golden_Triangle_(Southeast_Asia) https://en.wikipedia.org/wiki/Golden_Triangle_(So

Can't be any more porous than borders in Asia. https://en.wikipedia.org/wiki/Golden_Triangle_(Southeast_Asia) https://en.wikipedia.org/wiki/Golden_Triangle_(Southeast_Asi... China is right next to a major drug smuggling region. The jungles and mountains southwest of the country aren't exactly easy places to build border fences.