State Department's Trafficking in Persons Report: Scope, Aid Restrictions, and Methodology [September 19, 2017] [open pdf - 1MB]
"The State Department's annual release of the Trafficking in Persons report (commonly referred to as the TIP Report) has been closely monitored by Congress, foreign governments, the media, advocacy groups, and other foreign policy observers. The 109th Congress first mandated the report's publication in the Trafficking Victims Protection Act of 2000 (TVPA; Div. A of the Victims of Trafficking and Violence Protection Act of 2000, P.L. 106-386). Over time, the number of countries covered by the TIP Report has grown, peaking at 188 countries, including the United States. In the 2017 TIP Report, the State Department categorized 187 countries. Countries were placed into one of several lists (or tiers) based on their respective governments' level of effort to address human trafficking between April 1, 2016, and March 31, 2017. An additional category of special cases included three countries that were not assigned a tier ranking because of ongoing political instability (Libya, Somalia, and Yemen)."
CRS Report for Congress, R44953
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html