Police can generally hold you without charges for up to 48 hours after a warrantless arrest under the federal constitutional standard, and some states extend that window to 72 hours. How long police can hold you without charges depends on what kind of detention you’re in: a brief street stop is measured in minutes, while a post-arrest hold runs on the 48-hour clock set by the Supreme Court. Different rules govern each situation, and knowing which one applies tells you when your detention has gone past what the law allows.
The 48-Hour Rule After Arrest
Once police arrest you without a warrant, the Fourth Amendment requires a judge or magistrate to review whether there was probable cause for the arrest before the government can keep holding you.1Justia U.S. Supreme Court Center. Gerstein v. Pugh, 420 U.S. 103 (1975) In 1991, the Supreme Court put a number on how quickly that has to happen. County of Riverside v. McLaughlin set the deadline at 48 hours from the time of arrest.2Justia U.S. Supreme Court Center. County of Riverside v. McLaughlin, 500 U.S. 44 (1991)
The 48 hours is not a guaranteed holding period. The probable cause determination still has to be made “as soon as is reasonably feasible.” If police keep you longer than 48 hours without bringing you before a judge, the government has to prove a genuine emergency or extraordinary circumstance caused the delay. Routine scheduling, weekend staffing shortages, and the convenience of consolidating paperwork do not qualify as valid reasons.3Library of Congress. County of Riverside v. McLaughlin
State Variations
The 48-hour rule is a federal constitutional floor. States are free to set stricter deadlines, and many go the other direction and allow longer windows for filing formal charges. A significant number of states give prosecutors up to 72 hours after arrest to decide whether to charge. Some states impose shorter windows. A handful use a 36-hour rule that excludes the day of arrest, Sundays, and legal holidays, which can stretch the actual calendar time before you see a judge. The exact deadline depends on where you were arrested.
Federal Arrests
In the federal system, Rule 5 of the Federal Rules of Criminal Procedure requires that anyone arrested be brought before a magistrate judge “without unnecessary delay.” That phrase is deliberately flexible rather than pegged to a specific hour count, but courts enforce it. If the arrest was warrantless, prosecutors also have to file a complaint establishing probable cause promptly in the district where the alleged offense occurred.4Legal Information Institute. Federal Rules of Criminal Procedure – Rule 5. Initial Appearance A related rule, the McNabb-Mallory doctrine, adds a sharper edge: any confession obtained during an unnecessary delay of more than six hours between arrest and the first court appearance can be excluded at trial.
Street Stops Without an Arrest
Not every police detention is an arrest. The shortest form is the investigative stop, often called a Terry stop after the 1968 Supreme Court decision authorizing it. An officer with reasonable suspicion of criminal activity may briefly stop and question you without the probable cause needed for a full arrest.5Justia U.S. Supreme Court Center. Terry v. Ohio, 392 U.S. 1 (1968)
There is no bright-line time limit on a Terry stop. The Supreme Court held in United States v. Sharpe that even a 20-minute detention could be reasonable depending on the circumstances.6Justia U.S. Supreme Court Center. United States v. Sharpe, 470 U.S. 675 (1985) What matters is whether police diligently pursued the investigation using the least intrusive methods available to confirm or rule out their suspicions.7Legal Information Institute. Florida v. Royer In practice, most Terry stops last a few minutes to roughly 20. An officer who keeps you on the sidewalk for two hours without arresting you has almost certainly crossed the line into an unlawful seizure. If police need more time, they must either release you or develop probable cause for an actual arrest.
Why You May Sit Longer Than You Expect
The 48-hour ceiling is a legal limit, not a prediction. Several practical factors influence whether you’re out in a few hours or waiting the full window.
- Day and time of arrest. A Friday night arrest is the worst case. Courts often don’t hold weekend sessions, so your probable cause hearing may not happen until Monday. The constitutional clock still runs, but weekend and holiday arrests regularly lead to longer holds.
- Complexity of the investigation. If police need lab results, witness interviews, or records from another jurisdiction, the administrative process takes longer before officers decide whether to recommend charges, upgrade them, or release you.
- Booking backlog. Large jails process many people at once. Fingerprinting, background checks, and warrant searches all take time, and busy facilities create bottlenecks.
- Local procedures. Some counties have streamlined booking systems that process people in under an hour. Others are notoriously slow.
Booking itself is not optional and does not count as unreasonable delay for purposes of the 48-hour rule. It typically includes recording your personal information and the charges, taking fingerprints and a photograph, and submitting that data to federal databases.8Office of Community Oriented Policing Services. TAP and the Arrest, Booking, and Disposition Cycle Your belongings are inventoried, you may be searched before entering the holding area, and a medical screening is standard at most facilities.
If You’re Held Past the Limit
Detention beyond the legal window is a constitutional violation, and there are three main remedies.
The most direct is a petition for habeas corpus. This asks a court to review whether your detention is lawful and order your release if it isn’t. Habeas is the classic tool for challenging any form of unlawful imprisonment, including a hold that has run past the probable cause deadline without a judicial determination or formal charges.
After the fact, you may have grounds for a civil rights lawsuit under 42 U.S.C. ยง 1983, which lets individuals sue government officials who violate their constitutional rights. Damages can cover lost wages, emotional distress, and legal costs, with punitive damages available in cases of willful misconduct. You have to prove actual injury; the constitutional violation on its own usually yields only nominal damages.
There is also an evidentiary consequence. Under the McNabb-Mallory doctrine, statements made during an unnecessarily prolonged detention can be suppressed at trial. In federal cases, that suppression rule applies to confessions obtained more than six hours after arrest when the delay is found to be unreasonable. The rule exists to discourage police from dragging their feet on your first court appearance in the hope of getting you to talk.
When the Hold Ends
A brief hold ends in one of two ways: release or formal charges.
If police decide they lack sufficient evidence, they release you. An arrest that doesn’t lead to charges still creates a record, though some jurisdictions allow you to petition for expungement. If prosecutors move forward, formal charges are filed and you’re brought before a judge for an initial appearance or arraignment. At that hearing, you’re told the specific charges, informed of your rights, and asked to enter a plea.9United States Department of Justice. Initial Hearing / Arraignment
The judge also decides whether to release you or keep you in custody pending trial. In many cases the judge sets a bail amount. If you post it, you’re released with an obligation to return for future court dates. If the judge determines you’re not a flight risk or a danger to the community, you may be released on your own recognizance with no money required.9United States Department of Justice. Initial Hearing / Arraignment If you can’t make bail, you stay in custody until trial or until a bail reduction is granted.