This isn't true. At the airport there is a passport check after security. At Hung Hom train station the same. At all the China land borders things are pretty st

This isn't true. At the airport there is a passport check after security. At Hung Hom train station the same. At all the China land borders things are pretty strict. Most smugglers go through Sha Tau Kok in the north east, but you need a permit to even enter that area.