Why you should be wary of statistics on ‘modern slavery’ and ‘trafficking’

http://www.washingtonpost.com/blogs/fact-checker/wp/2015/04/24/why-you-should-be-wary-of-statistics-on-modern-slavery-and-trafficking/

http://www.theguardian.com/global-development/poverty-matters/2014/nov/28/global-slavery-index-walk-free-human-trafficking-anne-gallagher