The document discusses the increasing use of internal border enforcement programs like 287(g) agreements and Secure Communities within the United States post-9/11. 287(g) agreements allow local law enforcement to perform immigration enforcement, while Secure Communities involves sharing arrestee fingerprints with immigration authorities. A map shows the spread of 287(g) agreements across multiple jurisdictions. The document concludes by providing contact information for following up on the topic of internal immigration enforcement programs.