"People trafficking is a huge business with profits for organised crime of over $30billion."
I am going to go out on a limb here and say that, if we have learned anything from the War on Drugs, then the solution to this problem is probably not increased criminal penalties for prostitution.
Perhaps the solution is to educate people - both young women who are at-risk of getting caught up in human trafficking, as well as men who may be likely to pay for sex and may not be aware of the problem of human trafficking.