to inform policy and assess the effects of immigration in the United States . Their mission includes the collection of data regarding Border Patrol , Detention and Removal , Intelligence , Investigations, and Inspections. Links of the data sources are http://www.dhs.gov/files/statistics/publications/yearbook.shtm http://www.dhs.gov/files/statistics/data/ http://www.dhs.gov/files/statistics/immigration.shtm http://www.suite101.com/content/us-immigration-trends-from-mexico-a305185 http://lawprofessors.typepad.com/immigration/2010/07/new-website-for-office-of-immigration-statistics.html 7. U.S. National Center for Health