How Do Search and Seizure Rules Apply in the Military Context?

The Fourth Amendment applies to service members, and Military Rules of Evidence 311 through 317 put it into practice at courts-martial. Two features set the military apart: a commander, military judge, or military magistrate can issue a search authorization in place of a warrant, and inspections conducted for readiness are not searches at all. Evidence from an unlawful search can be excluded, but only on a timely defense motion and subject to exceptions such as good faith and inevitable discovery.

The rules that govern

Rule	Subject
M.R.E. 311	When unlawfully obtained evidence is excluded, exceptions, and motion practice
M.R.E. 312	Body views and intrusions
M.R.E. 313	Inspections and inventories
M.R.E. 314	Searches not requiring probable cause
M.R.E. 315	Probable cause searches: authorizations, warrants, and exigencies
M.R.E. 316	Seizures, including plain view
M.R.E. 317	Interception of wire and oral communications

Who can authorize a search

A search authorization is “express permission, written or oral, issued by competent military authority” to search for specified property, evidence, or a person (M.R.E. 315(b)(1)). Under M.R.E. 315(d), it is valid only if issued by an impartial individual who is:

a commander (or a person in a designated command-type position) with control over the place where the property or person is located, or, if the place is not under military control, control over persons subject to military law;
a military judge or magistrate, if authorized by regulation; or
another competent search authority designated by regulation.

Only a military judge may issue a warrant for wire or electronic communications (M.R.E. 315(d); R.C.M. 703A).

Probable cause. “Probable cause to search exists when there is a reasonable belief that the person, property, or evidence sought is located in the place or on the person to be searched.” The authorization may rest on hearsay, and the official may rely on written statements, oral statements (including by telephone), or information the official already knows that would not prevent impartial action (M.R.E. 315(f)(2)).

Impartiality. The rule says an otherwise impartial official “does not lose impartiality merely because the official is present at the scene of a search or is otherwise readily available”, or because the official previously and impartially authorized investigative steps (M.R.E. 315(d)). Whether a particular commander crossed from decision-maker to participant in the investigation is a factual question the defense can raise in a suppression motion.

Inspections and inventories are not searches

Inspection. An inspection is “an examination of the whole or part of a unit, organization, installation, vessel, aircraft, or vehicle, including an examination conducted at entrance and exit points, conducted as an incident of command the primary purpose of which is to determine and to ensure the security, military fitness, or good order and discipline” of the unit (M.R.E. 313(b)). It may use technological aids and may be done with or without notice. “An order to produce body fluids, such as urine, is permissible in accordance with this rule” (M.R.E. 313(b)(1)), which is the basis for inspection urinalysis.

The limit. “An examination made for the primary purpose of obtaining evidence for use in a trial by court-martial or in other disciplinary proceedings is not an inspection” (M.R.E. 313(b)(2)).

The higher burden. When a purpose of an examination is to locate weapons or contraband, the prosecution must prove by clear and convincing evidence that it was a genuine inspection if any of three triggers applies: the examination was ordered immediately after a report of a specific offense and was not previously scheduled; specific individuals were selected; or persons examined were subjected to substantially different intrusions (M.R.E. 313(b)(3)(B)). Outside that combination, the heightened standard does not apply.

Inventory. An inventory is an administrative accounting for property, not a prosecutorial step; one made for the primary purpose of gathering evidence is not an inventory (M.R.E. 313(c)).

Searches that do not require probable cause

M.R.E. 314 lists them:

Border searches for customs or immigration purposes authorized by federal statute.
Entry and exit searches abroad, at installations, enclaves, aircraft, and vessels on foreign soil or in foreign or international airspace or waters, when authorized by the commander.
Government property, unless the person to whom it is issued has a reasonable expectation of privacy in it. “Normally a person does not have a reasonable expectation of privacy in government property that is not issued for personal use”; wall or floor lockers in living quarters issued for personal possessions “normally are issued for personal use” (M.R.E. 314(d)).
Consent searches. Consent may be limited and “may be withdrawn at any time”, must be voluntary, and “submission to the color of authority” of law enforcement personnel is not voluntary consent; the prosecution “must prove consent by clear and convincing evidence” (M.R.E. 314(e)).
Stop and frisk, and a protective search of a vehicle’s passenger compartment during a lawful stop, on reasonable suspicion that the person is armed and dangerous (M.R.E. 314(f)).
Searches incident to apprehension, including the area within immediate control and protective sweeps (M.R.E. 314(g)).
Searches within jails and confinement facilities, authorized by those with authority over the facility (M.R.E. 314(h)).
Emergency searches to save life or prevent immediate injury (M.R.E. 314(i)).
Open fields and woodlands (M.R.E. 314(j)).

Probable cause without an authorization: exigency and plain view

Exigency. A probable cause search needs no authorization when “there is a reasonable belief that the delay necessary to obtain a search warrant or search authorization would result in the removal, destruction, or concealment of the property or evidence sought.” Military operational necessity can create an exigency by preventing communication with an authorizing official (M.R.E. 315(g)). Probable cause is still required.

Plain view. Property may be seized when a person “while in the course of otherwise lawful activity observes in a reasonable fashion property or evidence that the person has probable cause to seize” (M.R.E. 316(c)(5)(C)). Abandoned property may be seized without probable cause (M.R.E. 316(c)(2)).

When evidence is excluded

Under M.R.E. 311(a), evidence from an unlawful search or seizure by a person acting in a governmental capacity is inadmissible only if three conditions are met:

the accused makes a timely motion to suppress or objection;
the accused had a reasonable expectation of privacy in what was searched, or a legitimate interest in what was seized, or other constitutional grounds to object; and
“exclusion of the evidence results in appreciable deterrence of future unlawful searches or seizures and the benefits of such deterrence outweigh the costs to the justice system.”

Timing. Evidence disclosed before arraignment must be challenged before the plea is entered; otherwise the objection is waived unless the military judge allows it later for good cause (M.R.E. 311(d)(2)(A)).

Burden. Once the defense moves or objects, the prosecution must prove by a preponderance of the evidence that the evidence was lawfully obtained or that an exception applies (M.R.E. 311(d)(5)(A)).

Exceptions (M.R.E. 311(c)):

impeachment by contradiction of the accused’s own in-court testimony;
inevitable discovery;
good faith reliance on an authorization or warrant issued by a competent official who had a substantial basis for probable cause, judged by an objective standard;
objectively reasonable reliance on a statute or binding precedent later held unconstitutional.

Searches by civilian or foreign officials. A search by other federal, state, or local officials is unlawful under the rule if it violated the Constitution or “is unlawful under the principles of law generally applied in the trial of criminal cases in the United States district courts”. A search by foreign officials leads to exclusion only if it subjected the accused to “gross and brutal maltreatment” (M.R.E. 311(b)(2)-(3)). A military commander’s authorization is not required for a civilian police search to be usable.

Challenging probable cause. If the defense makes a substantial preliminary showing that an agent knowingly, intentionally, or recklessly included a false statement or omitted a material fact necessary to the probable cause finding, the defense is entitled to a hearing (M.R.E. 311(d)(4)(B)).

Frequently Asked Questions

Can a commander authorize a search of a barracks room?
Yes, if the commander has control over the place, is impartial, and finds probable cause (M.R.E. 315(d), (f)). A separately scheduled health-and-welfare inspection for readiness purposes is not a search and needs no probable cause, but an “inspection” whose primary purpose is to gather evidence against someone is not an inspection under M.R.E. 313.

Is a unit urinalysis a search?
An order to produce urine is permissible as part of an inspection under M.R.E. 313(b)(1). A collection whose primary purpose is to obtain evidence against a particular person falls outside the inspection rule and must meet search or consent requirements. Drug testing is discussed further in how the UCMJ addresses drug offenses.

What about questioning during a search?
Statements are governed by separate rules (the Article 31 warning and how it differs from Miranda; rights of the accused during military investigation). Article 31(b) requires a warning before anyone subject to the UCMJ questions a suspect in an official law-enforcement or disciplinary capacity, and the warning does not depend on custody.

Sources

The Bill of Rights: A Transcription, Fourth Amendment (National Archives)
Manual for Courts-Martial, United States (2024 ed.), Military Rules of Evidence 311 through 317; R.C.M. 703A

This article is general information about military law, not legal advice for any individual case.