[will4274]

The US has a porous border. You can't stop drugs from crossing if you can't stop people from crossing.

[magicsmoke]

Can't be any more porous than borders in 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.