Trafficking in persons (TIP) for the purposes of exploitation is believed to be one of the most prolific areas of international criminal activity and is of significant concern to the United States and the international community. According to Department of State estimates, roughly 800,000 people are trafficked across borders each year. If trafficking within countries is included in the total world figures, official U.S. estimates indicate that some 2 to 4 million people are trafficked annually. As many as 17,500 people are believed to be trafficked into the United States each year and some have estimated that 100,000 U.S. citizen (USC) children are victims of trafficking within the United States..