; and . (b) Effective date The amendments made by subsection (a) shall take effect on October 1, 2017. 4. Working to develop methodologies to assess prevalence of human trafficking (a) Working group (1) In general Not later than 1 year after the date of enactment of this Act, the Director of the National Institute of Justice, in consultation with the Director of the Human Smuggling and Trafficking Center, shall establish an expert working group, which shall include survivors of human trafficking, experts on sex and labor trafficking, representatives from organizations collecting data on human trafficking, and law enforcement officers. The working group shall, utilizing, to the extent practicable, existing efforts of agencies, task forces, States, cities, research institutions, and organizations— (A) identify the methodological and practical barriers hampering data collection on sex and labor trafficking; (B) identify the information that should be collected, and how that information should be collected; and (C) recommend practices that could be standardized as replicable best practices to promote better data comparison, aggregation, and analysis. (2) Pilot testing Not later than 3 years after the date of enactment of this Act, the Director of the National Institute of Justice shall implement a series of pilot studies to test promising methodologies studied under paragraph (1). (b) Report (1) In general Not later than 3 years after the date of enactment of this Act, the Director of the National Institute of Justice, in consultation with the Secretary of Labor, the Secretary of Health and Human Services, the Secretary of Homeland Security, and the Director of the Human Smuggling and Trafficking Center, shall submit to Congress a report, which includes— (A) the efforts made in developing robust, comprehensive methodologies to estimate the prevalence of human trafficking at the national and regional levels; (B) best practices for determining the trends of human trafficking in the United States