I think the only thing you can say is that it takes just a lot of hard work by police officers and immigration people on the ground. I go into massage parlours all the time with a Cantonese- or Mandarin-speaking interpreter, whatever the case may be. I hand out my card and I get my face shown, and I tell them over and over and again that if they need help, this is the number for them to call and they will not be sent to jail.
So you need to constantly be in their face so that when the time comes, when the moment comes when they want out, they know who to call. That's just one comment that I'd like to make.