Drug-related homicides have dramatically increased in recent years in Mexico along the nearly 2,000-mile border it shares with the United States. U.S. federal, state, and local officials have stated that the prospect of crime, including violence, spilling over from Mexico into the south-western United States is a concern. This book reviews the crime rates and assesses information on spillover crime along the border, with a focus on what information reported crime rates in south-west border communities provide on spillover crime; and what efforts have federal, state, and local law enforcement agencies made to track this issue.