National Guard members can arrest civilians only when they are operating under state command and have been granted that power by state law, a governor’s emergency proclamation, or formal deputization by a law enforcement agency. National Guard arrest authority does not exist by default; it has to be affirmatively given. When the Guard is called into federal service under Title 10, a separate federal law bars its members from arresting civilians at all, with narrow exceptions.
Activation Status Decides What the Guard Can Do
Everything about arrest power turns on how the Guard was called up. There are three possibilities, and they are not interchangeable.
Under Title 10, the President calls Guard units into federal service. Members become part of the federal military and answer to the President; the governor loses operational control.1Office of the Law Revision Counsel. 10 USC 12406 – National Guard in Federal Service: Call Once federalized, Guard personnel are “subject to the laws and regulations governing the Army or the Air Force.”2Office of the Law Revision Counsel. 10 USC Chapter 1211 – National Guard Members in Federal Service That is the sentence that triggers the ban on civilian law enforcement.
Under Title 32, Guard members stay under the governor’s command but draw federal funding and meet federal regulations. This hybrid status covers training, counter-drug missions, and border support.3Office of the Law Revision Counsel. Title 32 – National Guard Because the troops are not in federal service, most federal restrictions on law enforcement do not reach them.
Under State Active Duty, the governor alone activates the Guard using state authority and state funds. This is the status used for natural disasters and civil disturbances. Any law enforcement power comes from state law.
Why Federalized Guard Cannot Arrest Civilians
The Posse Comitatus Act makes it a crime to willfully use the Army, Navy, Marine Corps, Air Force, or Space Force to execute domestic laws. Violations carry a fine, up to two years in prison, or both.4Office of the Law Revision Counsel. 18 USC 1385 – Use of Army, Navy, Marine Corps, Air Force, and Space Force as Posse Comitatus The statute also specifies that it grants military personnel no authority to conduct criminal investigations, searches, seizures, or arrests of civilians.5Office of the Law Revision Counsel. 18 USC Ch 67 – Military and Navy
The Act reaches the National Guard only when its members have been federalized under Title 10. Under Title 32 or State Active Duty, Guard personnel are not part of the federal armed forces, so the Act does not apply to them. That is why a governor can direct Guard troops to assist police during a state emergency while the President generally cannot use the same troops the same way once they are federalized.
In practice, federalized Guard members are limited to indirect support: sharing intelligence, providing logistics and transportation, or operating equipment behind the scenes. They cannot stop, search, or arrest anyone. The National Guard Bureau’s own regulations list “arrest, apprehension, stop and frisk, or similar activity” among the prohibited actions for personnel in Title 10 status.6National Guard Bureau. National Guard Domestic Law Enforcement Support and Mission Assurance Operations
The Insurrection Act Exception
The Insurrection Act is the main carve-out from the Posse Comitatus Act. It allows the President to use federal military forces, including federalized Guard units, for domestic law enforcement in three situations: at a state’s request when the state faces an insurrection against its own government; to enforce federal law when unlawful obstruction or rebellion makes normal court proceedings impossible; and to protect constitutional rights when state authorities are unable or unwilling to act.7Office of the Law Revision Counsel. 10 USC Chapter 13 – Insurrection8Office of the Law Revision Counsel. 10 USC 252 – Use of Militia and Armed Forces to Enforce Federal Authority
Before any troops move, the President must issue a proclamation ordering the people involved to disperse and return home within a set time.9Office of the Law Revision Counsel. 10 USC 254 – Proclamation to Disperse The proclamation creates a public record of the legal basis for deployment and gives people time to comply before military force comes into play.
How State-Command Guard Gets Arrest Power
Removing the Posse Comitatus Act does not hand Guard troops a badge. When the Guard operates under the governor through State Active Duty or Title 32, any law enforcement power still has to come from somewhere specific. The National Guard Bureau’s regulations confirm that state-commanded Guard units may provide direct participation in civil law enforcement activities such as searches, seizures, and detention only “when approved by the Governor.”6National Guard Bureau. National Guard Domestic Law Enforcement Support and Mission Assurance Operations
That approval typically arrives in the form of a gubernatorial emergency proclamation that activates specific state statutes. The proclamation defines the mission’s scope, and the Guard’s authority is limited to what the proclamation and underlying state law allow. These proclamations are temporary. Duration and renewal rules vary by state, but 30- to 90-day windows with legislative review are common.
Deputization
The clearest way to put arrest power in a Guard member’s hands is formal deputization. A local sheriff, state police agency, or federal law enforcement agency swears in Guard personnel and grants them the authority of the deputizing agency’s officers. A deputized Guard member can make arrests, conduct searches, and process individuals into the justice system, but only within the scope the deputizing authority sets.
Recent border operations show how this plays out. In 2025, the U.S. Border Patrol Chief deputized over 300 Texas National Guard soldiers, granting them “limited law enforcement authority to make immigration arrests” while working alongside Border Patrol agents.10U.S. Customs and Border Protection. Texas National Guard Sworn in to Support Border Patrol Efforts in El Paso Sector The word “limited” matters. Deputization does not turn a Guard member into a fully certified police officer. The authority is temporary, narrow, and exercised under the deputizing agency’s supervision.
Without Deputization
Guard members under state command without deputization still have options. The National Guard Bureau regulations note that when apprehension of civilians becomes necessary during civil disturbance operations, Guard forces will act “in accordance with guidelines established by the state attorney general in accordance with state law.”6National Guard Bureau. National Guard Domestic Law Enforcement Support and Mission Assurance Operations The same regulations stress that “the apprehension of civilians during civil disturbance operations is best left to civilian law enforcement to the maximum extent possible.” The default plan is for Guard troops to secure a scene and hand it off to police.
Detention Is Not the Same as Arrest
There is a real gap between holding someone briefly and formally arresting them, and the gap matters most for Guard members who have not been deputized.
A formal arrest requires probable cause: enough facts that a reasonable person would believe a crime was committed and the person being arrested committed it. It leads to booking, processing, and entry into the criminal justice system.11Legal Information Institute. Probable Cause Unless state law grants arrest power or a Guard member has been deputized, performing a formal arrest is outside their authority.
Temporary detention is a different thing. Like any private person, a Guard member who witnesses a crime in progress can physically restrain the individual and hold them until police arrive. Most states recognize some version of this through citizen’s arrest statutes, though the specific rules vary. The common requirement is that the person doing the detaining has to have actually witnessed the offense. That is a narrower standard than what police officers work under, and Guard members who go past it face civil and criminal liability. In most deployments, the job is to secure the scene and hand custody to civilian law enforcement for formal processing.
What Happens If a Guard Member Oversteps
Liability depends, once again, on activation status.
Guard personnel on Title 32 duty are covered by the Federal Tort Claims Act. Congress extended that coverage to National Guard soldiers performing full-time National Guard duty or inactive-duty training in 1981, so negligence claims from their actions are processed as claims against the federal government.12eCFR. 32 CFR 536.97 Scope for Claims Under the National Guard Claims Act A person harmed by a Guard member on Title 32 duty sues the United States, not the individual soldier.
State Active Duty works differently. Federal claims statutes do not apply when Guard members are performing state active duty.12eCFR. 32 CFR 536.97 Scope for Claims Under the National Guard Claims Act Liability falls under state law, and the protections available depend on the state’s tort claims act and sovereign immunity rules. Guard members performing discretionary functions under state command may be able to assert qualified immunity if sued for constitutional violations, but only if their actions were objectively reasonable under established law. A Guard member who arrests without authority, uses excessive force, or acts outside the mission’s scope is unlikely to find shelter in that defense.
The same unit can shift from Title 32 to State Active Duty during the same emergency, and the liability framework changes the moment the status does. For anyone trying to understand what a Guard member on the street can and cannot do, the first question is always the same: under which authority were they called up?