Why don’t we know if anti-trafficking initiatives work?

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From openDemocracy:

Over fifteen years after the UN Trafficking Protocol was adopted, the evidence available to determine how much progress has been made in combatting human trafficking remains very limited. At all levels of anti-trafficking work, the collection and analysis of data to support a results-based approach continues to be underemphasised, particularly in comparison to the use of emotionally-charged rhetoric and hyperbole.