Martial law in Hawaii is legally possible but tightly constrained. The governor can call out the Hawaii National Guard and declare a state of emergency on his or her own authority, yet the deeper features people associate with martial law — suspending habeas corpus, replacing civilian judges with military tribunals, detaining people without charges — require legislative authorization under the state constitution and run into a hard federal ceiling set by the Supreme Court after Hawaii’s three-year experience with military rule during World War II.
Who Can Declare Martial Law in Hawaii
The Hawaii Constitution does not contain a single provision labeled “martial law.” The governor’s military authority flows from Article V, Section 5, which makes the governor commander in chief of the state’s armed forces and allows calling them out to enforce the laws, suppress insurrection or lawless violence, and repel invasion. That is enough to mobilize the National Guard. It is not enough to displace civilian government.
The deeper powers live in Article I, Section 15, which governs suspension of habeas corpus. The privilege of the writ “shall not be suspended unless, when in cases of rebellion or invasion, the public safety may require it,” and the power to suspend habeas corpus and laws “shall never be exercised except by the legislature, or by authority derived from it to be exercised in such particular cases only as the legislature shall expressly prescribe.”1FindLaw. Hawaii Constitution Article I, Section 15 – Suspension of Habeas Corpus A governor acting alone cannot suspend the writ or set aside civilian law. The legislature must act, or must have pre-authorized the governor to act in specifically defined circumstances.
That two-step design sets a higher bar than many people assume. Troops in the street? The governor can order that today. Military judges hearing criminal cases in place of state courts? Not without the legislature, and even then, only within limits federal courts have already drawn.
What a State of Emergency Does and Does Not Allow
The practical framework most Hawaii residents will encounter is not martial law at all. It is a state of emergency under HRS Chapter 127A. Under HRS § 127A-14, the governor may declare a state of emergency by proclamation upon finding that an emergency or disaster has occurred or is imminent, and the governor is “the sole judge” of whether the danger justifies the declaration. The emergency automatically terminates after sixty days unless the governor issues a new proclamation.2Justia Law. Hawaii Revised Statutes 127A-14 – State of Emergency
Once declared, HRS § 127A-13 activates a broad set of powers. The governor can quarantine or isolate people exposed to infectious disease, order property destroyed if it poses a public safety threat, authorize entry onto private land without the owner’s permission, and suspend any state law that interferes with efficient emergency response.3Justia Law. Hawaii Revised Statutes 127A-13 – Additional Powers in an Emergency Period Suspending laws is the strongest of these; it lets the governor set aside licensing rules, procurement procedures, and other legal obstacles while the crisis lasts.
Chapter 127A does not authorize military tribunals, military commissioners taking over executive agencies, or the trial of civilians by soldiers. A state of emergency keeps civilian institutions intact and expands executive power inside them. Martial law in the strong sense displaces those institutions. They are different legal animals, and the governor’s unilateral authority stops at the first.
Habeas Corpus and the Federal Backstop
Habeas corpus is the writ that forces the government to bring a detained person before a judge and justify the detention. If it is suspended, the military or police can hold people without charges and without a court hearing. The Hawaii Constitution limits suspension to rebellion or invasion, requires that public safety demand it, and routes the decision through the legislature.1FindLaw. Hawaii Constitution Article I, Section 15 – Suspension of Habeas Corpus
Even if the state suspends the writ, federal courts remain open. Under 28 U.S.C. § 2241, federal district courts can issue writs of habeas corpus for anyone “in custody in violation of the Constitution or laws or treaties of the United States.”4Office of the Law Revision Counsel. 28 USC 2241 – Power to Grant Writ A state-level suspension does not shut off federal review of whether a detention violates the U.S. Constitution. That is the route detainees used after Pearl Harbor, and it is the route still available today.
The WWII Precedent That Still Governs
Hawaii’s one real experience with martial law began hours after the December 7, 1941 attack on Pearl Harbor and did not fully end until October 24, 1944.5National Park Service. Martial Law in Hawai’i The military commander took the title of Military Governor. Civilian courts were initially forbidden to summon jurors, hear witnesses, or try cases. Military provost courts took over the entire docket, operating without juries, unbound by standard rules of evidence, and insulated from appellate review. Their penalties ran up to death. By August 1943, military authorities even barred judges from accepting habeas corpus petitions at all.6Justia U.S. Supreme Court Center. Duncan v Kahanamoku, 327 US 304
Two civilians eventually got their cases to the Supreme Court. In Duncan v. Kahanamoku (1946), Justice Black’s majority opinion held that the statutory grant of “martial law” authority “while intended to authorize the military to act vigorously for the maintenance of an orderly civil government and for the defense of the islands against actual or threatened rebellion or invasion, was not intended to authorize the supplanting of courts by military tribunals.”7Legal Information Institute. Duncan v Kahanamoku, Sheriff The Court added that civilians are “entitled to the Constitutional guarantee of a fair trial to the same extent as those who live in any other part of our country.”
The practical line the Court drew matters more than any single quotation. Military tribunals may not replace civilian courts while civilian courts remain capable of functioning, even in limited form. At the time of the trials under review, schools, bars, and theaters had reopened in Hawaii, which the Court took as evidence that civilian government had not collapsed.6Justia U.S. Supreme Court Center. Duncan v Kahanamoku, 327 US 304 Duncan does not say martial law is never permissible. It says the government must show that civilian courts truly cannot operate, not merely that the military finds civilian oversight inconvenient.
Federal Limits on Using Troops Against Civilians
Separate federal law restricts the use of military force for ordinary law enforcement. The Posse Comitatus Act, 18 U.S.C. § 1385, makes it a criminal offense to use the Army, Navy, Marines, Air Force, or Space Force to execute civilian laws, except where “expressly authorized by the Constitution or Act of Congress.”8Office of the Law Revision Counsel. 18 USC 1385 – Use of Army, Navy, Marine Corps, Air Force, and Space Force as Posse Comitatus Violations carry up to two years in prison.
The main statutory exception is the Insurrection Act. Under 10 U.S.C. § 252, the President may call up the militia and use the armed forces when “unlawful obstructions, combinations, or assemblages, or rebellion against the authority of the United States” make it impractical to enforce federal law through ordinary judicial proceedings.9Office of the Law Revision Counsel. 10 USC 252 – Use of Militia and Armed Forces to Enforce Federal Authority Before any deployment, the President must issue a proclamation ordering the insurgents to disperse within a stated time.10Office of the Law Revision Counsel. 10 USC 254 – Proclamation to Disperse
One important distinction: Posse Comitatus restricts federal troops. It does not restrict the Hawaii National Guard when the Guard is operating on state active duty under the governor’s orders. Guard members in that posture remain state forces and are not subject to the federal ban on domestic law enforcement. That is a large part of why, in a Hawaii emergency, the Guard is the force most likely to appear on the street. The legal path is simpler and the governor keeps direct command.
If the Military Takes or Destroys Your Property
Military authorities operating under martial law or emergency powers may commandeer vehicles, buildings, supplies, and communications equipment. The Fifth Amendment provides that “private property” shall not “be taken for public use, without just compensation.”11Congress.gov. Amdt5.10.2 Public Use and Takings Clause In principle, you are owed fair market value for what the government takes.
In practice, the result depends on how a court characterizes the action. Federal courts have split on whether destruction of property during an emergency triggers compensation. Some hold that property destroyed under “police powers,” such as a building demolished to stop a spreading fire, is not compensable. Others apply a more fact-intensive analysis, weighing how foreseeable the destruction was and how severely it affected the owner. If military authorities seize or destroy something you own, recovering value will typically mean litigation in federal court, with the outcome turning on whether the court treats the loss as a wartime taking or as an emergency police action.
During the WWII occupation, the military controlled telephone systems, rationed civilian supplies, censored communications, and regulated prices, all without meaningful contemporaneous judicial review. Duncan and the cases that followed established that such actions are subject to constitutional limits. Enforcing those limits in the middle of an active emergency remains, as it was then, a slow and uncertain process.