This report focuses on how policy makers would identify any spillover of drug trafficking-related violence into the United States. This report provides an overview of Mexican drug trafficking organization structures, how they conduct business, and the relationship between the drug trafficking organizations in Mexico and their partnerships operating here in the United States; a discussion of the illicit drug trade between Mexico and the United States, as well as a discussion of factors implicated in drug trafficking-related violence; an analysis of the possible nature of any spillover violence that may arise, as well as issues involved in accurately identifying and measuring such violence; and an evaluation of available crime rate data and a discussion of how this data may or may not reflect changes in drug trafficking-related crime.