The Double Legal Track: What Happens When Undocumented Immigrants Face Criminal Charges

If an undocumented immigrant who entered the U.S. without inspection is arrested for a crime, they must deal with two different legal systems at the same time. They will face the local or state criminal courts for the crime they are accused of committing, and thefederal immigration system for their legal status in the country.

When an undocumented individual is arrested for a state or local crime (such as theft, assault, or driving offenses), they are prosecuted under local laws just like any U.S. citizen or legal resident. This criminal process takes precedent over an ICE detainer. An individual cannot bypass the criminal justice system simply because they are undocumented. The local prosecutor handles the criminal charges, and the defendant has constitutional rights, including the right to an attorney and due process. If convicted, the individual must serve their criminal sentence (jail or prison time) in the local or state facility before federal immigration enforcement can take physical custody of them.

When someone is booked into a jail, their fingerprints and identifying information are routinely shared with federal databases. If Immigration and Customs Enforcement (ICE) flags the person as an undocumented immigrant, they will typically issue an ICE Detainer (Form I-247). This detainer requests that the local jail hold the individual for up to 48 hours after their scheduled criminal release date (whether they post bail, the charges are dropped, or they finish their sentence) so ICE can transfer them to federal immigration custody. Note on "Sanctuary" Policies, some jurisdictions (often called sanctuary cities) have local laws that prohibit or restrict jail officials from honoring ICE detainers unless a judicial warrant is provided. In those areas, the jail may release the individual immediately upon the conclusion of their criminal case, requiring ICE to apprehend them in the community.

Once the individual is transferred to ICE custody, they enter civil administrative removal (deportation) proceedings. Because the individual has never checked in at a port of entry, they are legally classified as an "alien present without inspection." If an individual is apprehended within a certain timeframe and distance from the border, they may face expedited removal. However, if they are arrested deep within the interior of the country, they are generally placed in formal removal proceedings under 8 U.S.C. § 1229a before an immigration judge. The nature of the crime significantly dictates their immigration case. If convicted of a serious crime, such as an "aggravated felony" under 8 U.S.C. § 1101(a)(43), they lose virtually all eligibility to apply for legal relief (such as asylum or cancellation of removal) and will face mandatory detention and permanent deportation.

In addition to local state crimes and civil deportation, the act of entering the United States without passing through an official border checkpoint is itself a federal crime: Improper Entry: Under 8 U.S.C. § 1325, entering the country at an improper time or place, or eluding examination by immigration officers, is a federal misdemeanor punishable by fines and up to 6 months in prison for a first offense. The federal government has the option to prosecute the individual for this federal immigration crime alongside or after their state-level criminal proceedings.

Sanctuary policies are legal under federal law because the U.S. Constitution prohibits the federal government from forcing state and local officials to enforce federal programs. The federal government cannot arrest judges who release individuals instead of transferring them to Immigration and Customs Enforcement (ICE) because judges are protected by absolute judicial immunity, are bound by the Constitution's Tenth Amendment, and ICE detainers are voluntary administrative requests, not mandatory judicial warrants.

Why are Sanctuary Policies Are Legal? The legality of sanctuary policies is rooted in the Tenth Amendment of the U.S. Constitution, specifically a legal principle known as the Anti-Commandeering Doctrine. The U.S. Supreme Court has repeatedly ruled that the federal government cannot command state or local governments to enact or enforce federal regulatory programs. Because immigration enforcement is strictly a federal responsibility, states and cities have the legal right to choose how to allocate their own local law enforcement resources. Sanctuary policies generally limit local cooperation (such as holding individuals in jail past their release dates or sharing certain information). They do not actively conceal undocumented immigrants, block federal agents from making arrests, or exempt anyone from state and local criminal prosecution.

Federal authorities cannot arrest local or state judges for ordering the release of an individual due to several foundational legal protections. Judges possess absolute civil immunity for official actions taken within their jurisdiction. This ensures the judiciary remains independent and can make rulings based on the law without fear of personal liability or retaliatory arrest by the executive branch.

An ICE detainer is an administrative request issued by an immigration officer, not a warrant signed by a neutral judge. Under the Fourth Amendment, a person cannot be held in jail without a judicial warrant or probable cause of a criminal violation. Because remaining in the U.S. without legal status is generally a civil violation rather than a criminal offense, keeping someone in jail solely on an ICE detainer after their local criminal case is resolved could expose the city or state to lawsuits for unlawful detention. If a local judge finishes presiding over a state criminal case and orders a defendant released (either on bail, because charges were dropped, or because their sentence was served), the judge is fulfilling state law. A federal arrest of that judge for executing their legal duties would violate the separation of powers and the constitutional sovereignty of the state.

While the federal government cannot arrest local officials or judges, it frequently uses financial leverage- such as threatening to withhold certain federal law enforcement grants - to encourage cooperation, though these efforts are heavily litigated in federal court.

Ultimately, the intersection of criminal law and immigration enforcement creates a complex web of jurisdictional boundaries, constitutional rights, and political tension. While an individual must answer for local crimes just like any citizen, their undocumented status introduces parallel federal civil and criminal consequences that can fundamentally alter their future. The legal battles surrounding sanctuary cities, the Anti-Commandeering Doctrine, and the non-mandatory nature of ICE detainers further highlight the stark constitutional division between local authority and federal immigration mandates. As the federal government continues to leverage financial pressure against non-cooperative jurisdictions, this intricate legal landscape remains a fiercely debated frontline of American jurisprudence.