Your suspicions are likely correct. The entire human trafficking discussion is filled with statistics and data that come from nebulous and unverifiable sources. By creating sources out of thin air, law enforcement and its advocates are able to deflect criticism and defend the subjugation of sex workers. Try the book "Sex at the Margins" for a deeper anthropological look at the subject. https://www.lauraagustin.com/sex-at-the-margins-migration-la...