HSI Special Agent Training (HSISAT) Exam 3 Practice 2026 – The All-in-One Resource to Master Your Exam Preparation!

HSI, or Homeland Security Investigations, is a key component of the U.S. Department of Homeland Security (DHS). This agency focuses on immigration enforcement, customs investigations, and the prevention of various criminal activities such as human trafficking and drug smuggling. Being part of the DHS allows HSI to operate in a broad spectrum of national security and law enforcement areas, directly supporting the department's mission to safeguard the country against threats and ensure lawful immigration practices.

The connection to the DHS is crucial because it underscores HSI's role in coordinating efforts to protect the borders and maintain public safety, distinguishing it from other agencies that have different mandates or focuses, such as the Federal Bureau of Investigation, the Department of Justice, or U.S. Customs and Border Protection, which deals primarily with border and customs enforcement rather than the wider range of investigations HSI conducts.