The news and law love using the term human trafficking when most of the time, there's no evident of that. Just because they don't have PR or citizenship, doesn't mean that they are trafficked. They come and go as they please. The providers are here to make as much money as they can. Most don't have any intention to stick around because their families are back country of origin.
It's just like saying the farming and hotel / service industries staff are being trafficked.
Great for news, but not really the truth.
Human trafficking does happen, but rarely in amps. Word of mouth spread about how much $$$ they can make here. They know what job they will be working, no surprises. And many makes a killing because of us (their customers)
LE love busting these places because they confiscate lots of cash and great publicity.