The United Nations Office on Drugs and Crime has compiled a database providing caselaw regarding human trafficking. You can use the link below to search the databse by country or by keyword.
Within the U.S. Department of State is the Office to Monitor and Combat Trafficking in Persons (OMCTP). The OMCTP conducts reports on countries around the world. Within the Trafficking in Persons Reports are countries' evaluations. These evaluations are organized alphabetically and include recommendations to that specific country as well as prosecution, protection, and prevention summaries. The Trafficking in Persons Reports categorize countries by tiers.