There is no single answer to how long police hold evidence. Retention runs anywhere from a few weeks for personal items in a resolved misdemeanor to permanently for unsolved homicides and certain biological evidence. Three things drive the timeline: the status of the criminal case, the type of evidence involved, and whether the underlying crime carries a statute of limitations.
While the Case Is Still Open
During an active investigation, police hold every item they consider relevant. That obligation continues through charging, pretrial motions, trial, sentencing, and appeals. Releasing evidence while any of those stages is pending would compromise both the prosecution and the defendant’s right to examine the material.
If no suspect has been identified, the statute of limitations sets the minimum holding period. Most federal offenses carry a five-year deadline for prosecutors to file charges.1Office of the Law Revision Counsel. 18 USC 3282 – Offenses Not Capital State deadlines vary by offense. Once that clock runs out on an unsolved case, the evidence is no longer needed for prosecution and can be scheduled for return or disposal.
Severity of the crime changes everything. Federal capital offenses have no statute of limitations, so an indictment can be filed at any time.2Office of the Law Revision Counsel. 18 USC 3281 – Capital Offenses Most states follow the same rule for murder. Evidence from an unsolved homicide can sit in a police evidence room indefinitely, which is one reason DNA advances have solved cases decades old.
After the Case Ends
Acquittal or Dismissal
When a jury returns a not-guilty verdict or charges are dismissed, the state’s reason for holding most evidence disappears. Property belonging to the defendant or a third party becomes eligible for release once the case is officially closed. The real-world wait depends on how quickly the prosecutor signs off and how backlogged the evidence unit is.
Conviction
A conviction stretches the timeline substantially. Police and prosecutors preserve evidence through the full sentence, including any period of incarceration, and until direct appeals are resolved. Post-conviction proceedings like habeas petitions or claims of newly discovered evidence can revive the need for physical items years after trial.
No Charges Ever Filed
If an investigation stalls and no one is charged, police hold the evidence until the statute of limitations expires. For a federal offense with a five-year deadline, that means five years from the date of the crime.1Office of the Law Revision Counsel. 18 USC 3282 – Offenses Not Capital For crimes with no limitations period, such as murder, the evidence stays in storage as long as the case file remains open.
How the Type of Evidence Changes the Timeline
What an item is determines whether it can ever be returned, how long it must be kept, and what happens to it afterward.
- Contraband. Items that are illegal to possess, such as controlled substances, are never returned. After the case concludes and appeals are exhausted, contraband is documented and destroyed.
- Instrumentalities of the crime. Weapons, tools, or vehicles used to commit an offense are held through the case and all appeals, and are often subject to forfeiture. Even without forfeiture, these items rarely come back until every proceeding has wrapped up.
- Personal property. Belongings merely seized as evidence, like a phone containing relevant photos or a stolen wallet recovered during a search, are eligible for return sooner. Once investigators have documented, photographed, or extracted the relevant data, the item’s evidentiary value drops. Victims may have a right under federal and state victims’ rights laws to get their property back as soon as it is no longer needed.
- Biological evidence and DNA. This category has the strictest preservation rules. Federal law requires the government to preserve biological evidence from any federal case in which a defendant is sentenced to imprisonment, and that duty lasts through the full term of incarceration. Even then, the government cannot destroy the biological material without first notifying the defendant and giving them 180 days to file a motion for DNA testing. Many states have their own preservation statutes, some requiring retention for 20 years or longer after conviction.3Office of the Law Revision Counsel. 18 USC 3600A – Preservation of Biological Evidence
One nuance on the federal biological-evidence rule: the preservation duty applies during imprisonment but does not extend through supervised release or parole. Once a defendant is released from prison, the requirement shifts to the 180-day notice-and-destroy procedure.4Federal Register. Preservation of Biological Evidence Under 18 USC 3600A State laws may be more protective, and federal law does not preempt any state or local rule requiring longer preservation.3Office of the Law Revision Counsel. 18 USC 3600A – Preservation of Biological Evidence
Forfeiture Runs on a Different Clock
People confuse evidence retention with civil asset forfeiture, and the mistake can be permanent. Evidence retention means police are holding your belongings because they’re relevant to an investigation; the items are supposed to come back when the case allows. Civil forfeiture is a separate legal action in which the government tries to take ownership of the property outright, usually claiming it was connected to a crime or represents its proceeds.
In a federal civil forfeiture case, the government files an action against the property itself. If you want to contest the seizure, you must file a claim by the deadline stated in the personal notice letter, which cannot be earlier than 35 days after the letter is mailed. If you never receive a letter, you have 30 days after the final publication of a public notice of seizure.5Office of the Law Revision Counsel. 18 USC 983 – General Rules for Civil Forfeiture Proceedings Miss that window and you can lose the property by default, regardless of whether you did anything wrong.
Federal law also provides an innocent-owner defense. If you can show by a preponderance of the evidence that you did not know about the illegal conduct, or that you took reasonable steps to stop it once you learned, your interest in the property is protected.5Office of the Law Revision Counsel. 18 USC 983 – General Rules for Civil Forfeiture Proceedings The burden is on you, so any forfeiture notice should be treated as a hard deadline.
Getting Your Property Back
Start by contacting the police department’s property and evidence unit with the case number. The detective on the case or the prosecutor’s office must authorize the release, confirming the item is no longer needed. Until that authorization comes through, the evidence unit cannot hand anything over.
Once release is authorized, you will typically schedule an appointment and bring a government-issued photo ID. Some agencies require proof of ownership for high-value items, such as a receipt or registration. If someone else is picking up on your behalf, most departments accept a notarized letter of authorization along with the representative’s photo ID.
Do not sit on a release notification. Agencies dispose of unclaimed property after a set window, and it varies: some jurisdictions give owners as little as 60 days from notification, others 90 or 180. After that, items may be auctioned, donated, or destroyed, and recovery becomes far harder if not impossible.
If the Agency Refuses to Release It
In federal cases, Federal Rule of Criminal Procedure 41(g) allows any person deprived of property to file a motion for its return in the federal district court where the property was seized. If the court grants the motion, it must order the property returned, though it can impose reasonable conditions to preserve the government’s access for future proceedings.6Legal Information Institute. Federal Rules of Criminal Procedure Rule 41 – Search and Seizure Most states have equivalent procedures for petitioning a state court. The core principle is the same everywhere: once the government has no legitimate reason to hold your belongings, a court can order them back.
Unclaimed and Forfeited Property
Property that no one claims after the waiting period enters a disposal pipeline. Agencies typically must first try to notify the owner by certified mail to the last known address or by publication. If no one responds within the required timeframe, the property is classified as abandoned.
Abandoned items are usually auctioned, with proceeds going to the agency’s general fund or, for federal forfeitures, into the Treasury’s Asset Forfeiture Fund.7U.S. Department of the Treasury. US Dept of the Treasury Seized Real Property Auctions Items with no resale value are destroyed. Firearms follow their own rules in most jurisdictions and are frequently destroyed rather than auctioned, whether or not they were claimed.
The best time to ask about your property is as soon as you learn the case has been resolved. Waiting months lets the disposal clock run, and once the items are gone, your only remaining option in most cases is a claim against the agency, which is harder to win than simply picking up your belongings on time.