LeadTrac is a database owned by the U.S. Immigration and Customs Enforcement (ICE) Homeland Security Investigations (HSI) Counterterrorism and Criminal Exploitation Unit (CTCEU). The function of LeadTrac is to vet and manage leads pertaining to visitors in the United States who are suspected of overstaying their period of admission or otherwise violating the terms of their admission, as well as organizations suspected of immigration violations. CTCEU and the Overstay Analysis Unit conduct research and enrich the leads in LeadTrac and, when appropriate, refer them to ICE field offices for investigation and enforcement action. LeadTrac’s structure supports a subject-centered data model, ensuring multiple leads about a single subject are linked within the system. This Privacy Impact Assessment describes how the LeadTrac system collects and uses Personally Identifiable Information.