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In this study, we addressed the need for empirical research on human trafficking by compiling unique data relating to criminal charges filed in federal judicial districts and using these data to examine trends in sex trafficking-related cases, as well as the impact on those trends of the Trafficking Victims Protection Act of 2000 (TVPA). Results from our regression models indicate that the proportion of all charges filed by federal prosecutors that involved sex trafficking and related cases increased significantly between 1994 and 2007. The rate of increase, however, slowed in the time period following the passage of the TVPA, suggesting that the TVPA may have helped to mitigate increases in new cases. In addition, our results show statistically significant inverse relationships between immigration and sex trafficking-related charges filed, providing new evidence to support the possibility that some sex trafficking-related cases may be being prosecuted as immigration cases instead.

A 2017 U.S. Senate subcommittee report charging employees at backpage.com with editing the website's online ads for prostitution has revived debate over the willingness and ability of such websites to screen ads for unlawful commercial sex activity. This study sheds light on the controversy by revisiting the dispute surrounding similar advertising on craigslist.com. Using an observational pre-post research design, I examined unique data collected from commercial sex ads on a North Carolina Craigslist site to assess the impact of enhanced ad screening measures that Craigslist implemented to address misuse of its ad hosting services. Results indicate that Craigslist's switch to a manual review of ads led to significant decreases in illicit ad content, temporarily inhibiting online marketing of commercial sex by regional advertisers.

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Given the stigma surrounding sex work and the illegal nature of many aspects of commercial sex activity, empirical research is lacking regarding the health-related behaviors of sex workers, particularly male sex workers who have sex with men (MSM sex workers). To better understand the MSM sex worker community and their potential health needs, we analyzed certain sexual health-related behaviors as advertised online by MSM sex workers in the San Francisco area. Using descriptive and bivariate statistical tests, we examined whether age- and race-related differences existed among these sex workers in the following publicly advertised behaviors: use of pre-exposure prophylaxis and a willingness to engage in illicit drug use or condomless anal intercourse. Although we found no significant differences by race in terms of advertised pre-exposure prophylaxis use or willingness to engage in condomless sex, our results show statistically significant differences by race with respect to willingness to use drugs. This difference could be driven by the younger average age of the non-White sex workers in our sample. These findings help inform our understanding of MSM sex work and its associated risks.