Immigration Enforcement

Immigration enforcement covers the government’s authority to police who is in the country, where they can be stopped or questioned, and how removal from the country is carried out. This work is split between agencies that guard the border and airports and agencies that operate inside the country, and it draws on a mix of federal statutes, agency policy, and constitutional limits that courts continue to work out.

At the border and points of entry, officers screen travelers, decide who may enter, and enforce visa terms, a set of powers and limits covered in Border Security and Inspection. These questions extend beyond the physical border, since agents also operate in communities and coordinate with local police, which is part of why the line between border authority and interior enforcement often blurs in practice.

Inside the country, agents identify, arrest, and process people believed to be in violation of immigration law. Interior Enforcement explains what these agents are authorized to do, the limits on their authority in homes and workplaces, and how their operations differ from routine policing.

Once someone is taken into custody, a separate set of rules governs how long they can be held, what hearings they are entitled to, and what happens when custody decisions are challenged, which Immigration Detention lays out. Enforcement does not end with removal: many people who leave or are removed face restrictions on returning, and the legal consequences of past violations, along with the practical difficulty of holding federal agencies accountable in court, are addressed in Bars to Reentry.