This reports provides an analysis of 100 research reports written on human trafficking in the United States and identifies the sources of primary data used by the reports. This research found that the majority of research relies upon the same two sources of primary data on human trafficking the State Department’s Trafficking in Persons Reports and Polaris’ National Human Trafficking Resources Center data. This survey found that some research reports on human trafficking that did not provide information on where the data they relied upon came from. This report and the accompanying chart of research report sources are designed to guide judges, policy makers and service providers to research reports on human trafficking in the United States that are currently the most reliable.