A subpoena is a legal order telling you to produce documents or show up and testify; a warrant is a judge’s authorization for police to arrest someone, search a place, or seize property. That is the heart of the subpoena vs. warrant distinction, and almost every other difference flows from it. One demands your cooperation with a legal proceeding. The other gives law enforcement permission to act whether you cooperate or not.
The Core Difference In One Sentence
A subpoena asks you for information. A warrant authorizes force. Everything else — who issues them, what legal standard applies, and what happens if you don’t comply — follows from that split.
What a Subpoena Is and Who Can Issue One
A subpoena compels you to participate in a legal proceeding by providing testimony, producing records, or both. It is not an accusation. Getting a subpoena does not mean you are suspected of anything; it means someone involved in a case believes you have information or documents that matter.
There are two basic forms. A subpoena ad testificandum requires you to appear at a specific time and place to give testimony, whether in a courtroom, a deposition, or an administrative hearing. A subpoena duces tecum requires you to turn over documents, electronic data, or physical items relevant to the case.1Legal Information Institute (LII) / Cornell Law School. Subpoena Duces Tecum Many combine both.
Here is the part that surprises most people: in federal civil cases, either a court clerk or an attorney authorized to practice in the issuing court can issue a subpoena.2Legal Information Institute. Federal Rules of Civil Procedure Rule 45 – Subpoena No judge needs to sign off. An attorney working on a case can generate one, fill in your name, and have it served. Criminal subpoenas work similarly under Federal Rule of Criminal Procedure 17, with somewhat more court oversight.3Legal Information Institute. Federal Rules of Criminal Procedure Rule 17 – Subpoena
Certain federal agencies can also issue administrative subpoenas on their own authority, without a court. The practical difference is enforcement. A judicial subpoena carries immediate legal force; ignoring it puts you in contempt. An administrative subpoena doesn’t. If you refuse to comply, the agency has to go to a federal district court and get an order compelling you to cooperate before noncompliance becomes contempt.4Office of the Law Revision Counsel. 18 U.S. Code 3486 – Administrative Subpoenas
What a Warrant Is and Who Can Issue One
A warrant authorizes law enforcement to take physical action against a person or place. It does not require your consent. Officers can execute it whether you agree or not.5Legal Information Institute. Warrant
Every warrant must be issued by a judge or magistrate, and every warrant must rest on probable cause. The Fourth Amendment is explicit: “no warrants shall issue, but upon probable cause, supported by oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.”6Legal Information Institute. Fourth Amendment A law enforcement officer submits a sworn statement explaining why there is reason to believe a crime occurred or that evidence exists in a specific location, and a judge decides whether the facts justify the intrusion.
There are three warrants you are most likely to encounter:
A search warrant permits officers to enter and search a specific location for specific items. Federal search warrants must be executed within 14 days, generally during daytime hours (6:00 a.m. to 10:00 p.m.) unless a judge specifically authorizes nighttime execution for good cause.7Legal Information Institute. Federal Rules of Criminal Procedure Rule 41 – Search and Seizure The warrant must identify what can be searched and what can be seized. Officers cannot use it as a license to rummage through everything in your home.
An arrest warrant names a specific person and authorizes police to take that person into custody. It requires the same probable cause showing as a search warrant.
A bench warrant is different in origin. Judges issue it from the bench, usually because someone failed to appear for a court date, violated probation, or ignored a court order. Police can still take you into custody, but the trigger is disobedience of a court directive rather than suspicion of a new crime.
Side-by-Side Comparison
Five differences cover almost everything you need to know:
- Purpose: A subpoena gathers information. A warrant authorizes physical action like an arrest or search.
- Target: A subpoena is directed at the person who has the information. A warrant is directed at law enforcement, giving officers permission to act against a named person or location.
- Issuing authority: An attorney or court clerk can issue a subpoena without a judge’s involvement. A warrant always requires a judge or magistrate.
- Legal standard: A subpoena generally requires only that the requested information be relevant to the proceeding. A warrant requires probable cause, a meaningfully higher bar demanding specific facts pointing to criminal activity or evidence.
- Noncompliance: Ignoring a subpoena can lead to contempt of court, which may bring fines or jail time. Resisting a warrant can result in immediate arrest and additional criminal charges.
What to Do If You Receive a Subpoena
A subpoena is a court order, and treating it casually is one of the fastest ways to end up in legal trouble. Federal courts can hold you in contempt for disobeying a subpoena without adequate excuse, and the court’s contempt power includes fines, jail time, or both.8Office of the Law Revision Counsel. 18 U.S. Code 401 – Power of Court
Read it carefully. The document will tell you what is demanded, whether testimony, documents, or both, along with a date and location. In federal civil cases, you have 14 days after service (or until the compliance date, whichever is sooner) to file a written objection to the production of documents or inspection of premises.2Legal Information Institute. Federal Rules of Civil Procedure Rule 45 – Subpoena State court deadlines vary.
Compliance is the default, but you are not out of options. An attorney can file a motion to quash or modify the subpoena on several grounds:
- Privilege. The subpoena seeks information protected by attorney-client privilege, doctor-patient privilege, or the work-product doctrine. Privileged material is generally not discoverable regardless of relevance.
- Undue burden. Complying would be unreasonably expensive, time-consuming, or disruptive relative to the value of the information. This is the most common objection for corporate records custodians hit with sweeping document requests.
- Overbreadth. The subpoena asks for far more than what is reasonably related to the case. Courts can narrow the scope rather than throw it out.
- Relevance. The information has no meaningful connection to the proceeding.
Even if you plan to object, don’t ignore the deadline. File your objection in writing and on time. A missed deadline can waive your right to challenge the subpoena at all.
One more thing matters from the moment the subpoena arrives: your duty to preserve. Deleting emails, shredding files, or wiping hard drives after receiving a subpoena is spoliation of evidence. Sanctions range from monetary penalties to a jury instruction telling the jury to assume the destroyed evidence was unfavorable to you. In extreme cases, a court can dismiss claims or enter default judgment, and intentional destruction can lead to criminal obstruction charges. If your organization receives a subpoena, issue a litigation hold immediately — pause any auto-delete policies, pull paper files out of the shredding queue, and notify anyone who might have relevant documents to stop routine deletion.
What to Do If Officers Arrive With a Warrant
The dynamic is completely different when officers show up at your door with a warrant. Police are not asking for cooperation. They have judicial authorization to act, and physically obstructing them will only make things worse.
Ask to see the warrant and read it. A search warrant will identify the specific premises to be searched and the items officers are looking for. An arrest warrant will name the person to be taken into custody. You are entitled to know the scope of what has been authorized.
You do not need to help officers find things or answer questions. The Fifth Amendment protects your right to remain silent and your right to have an attorney present during any questioning.9Legal Information Institute. Fifth Amendment – Section: Self-Incrimination Use those rights. Say you want a lawyer, then stop talking.
Contact a criminal defense attorney as soon as possible. For an arrest warrant, an attorney can sometimes arrange a voluntary surrender and negotiate bail conditions to minimize time in custody. For a search warrant, an attorney can observe whether officers stay within the warrant’s scope and document anything that may matter for a later challenge. Evidence obtained through an unconstitutional search or seizure generally cannot be used against you in court under the exclusionary rule.10Legal Information Institute (LII) / Cornell Law School. Exclusionary Rule
When Police Don’t Need a Warrant at All
The Fourth Amendment’s warrant requirement has well-established exceptions. If police search you or your property without a warrant, whether it holds up in court depends on whether one of these exceptions applies.11LII / Legal Information Institute. Exceptions to Warrant Requirement
- Consent. If you voluntarily agree to a search, police do not need a warrant. You can withdraw consent at any time.
- Search incident to arrest. When police lawfully arrest you, they can search your person and the area within your immediate reach. The Supreme Court has held that officers still need a warrant to search cell phone data found on an arrestee.12Legal Information Institute. Search Incident to Arrest Doctrine
- Exigent circumstances. When waiting for a warrant would result in someone getting hurt, evidence being destroyed, or a suspect escaping, officers can act immediately.
- Plain view. If an officer is lawfully present somewhere and sees contraband or evidence in plain sight, no warrant is needed to seize it.
- Vehicle searches. Cars get less Fourth Amendment protection than homes. Officers with probable cause to believe a vehicle contains evidence of a crime can search it without a warrant.
- Border searches. Customs officers can search people and belongings entering the country without probable cause or a warrant.
If you believe police searched you or your property without a valid warrant and without a legitimate exception, that is the kind of issue a defense attorney can challenge in court.
Don’t Confuse a Subpoena With a Summons
People sometimes mix up subpoenas and summonses, but they do different things. A summons notifies you that a lawsuit has been filed against you and requires you to respond, typically within a set number of days. It makes you a party to the case. A subpoena pulls you into someone else’s case as a witness or document holder. Ignoring a summons can result in a default judgment, with the court ruling against you because you never showed up to defend yourself. Ignoring a subpoena leads to contempt of court. Both are serious; the consequences just flow in different directions.