I have heard a Ang Mo country. I do not name the country.
These girls are sign very short contract to enter this country. Something like 3 months contract. As long as not local speaking girls, drug them & keep the girl each in a cubical to sell sex for $. These girls are not given any protect from pregnancy or sexual sickness. And all "customer" deposite their "Liquid" inside this is why they can ask for higher $.
After 3~6 months, usually these girls are pregnant. They were sent to unknow place blind fold. They were released. Which is now a big problem for the Government. These girls don't want the child, but already cannot abort. Average the Government found 20~30 such girls every month. The Government are pointing them as illegal over-stayer & trying to sent them back because they only have 3 months contract to enter the country.

Seems like both the agency & government are working hand in hand together.