As part of an investigation into the effects of S.B. 1070, the Arizona Daily Star collected thousands of records documenting local police calls to Border Patrol to check a person’s immigration status. Although the intention of the legislation was to standardize local immigration enforcement, the end result was a patchwork of policies and interpretations that engrained philosophical differences across jurisdictions.This series examines in depth the practices of 13 Southern Arizona law-enforcement agencies and the economic and legislative impacts of the law.