California Penal Code section 1524 is the statute that tells a judge when a search warrant may be issued in California. It lists specific grounds — evidence of a felony, stolen or embezzled property, firearms tied to domestic violence or protective orders, electronic records held by service providers, tracking devices, DUI blood draws, and outstanding arrest warrants, among others — and it layers on special procedures when the search targets a lawyer, doctor, psychotherapist, or member of the clergy. Everything else in California warrant practice, from probable cause to execution timing to challenges, works around that list.
Grounds That Allow a Warrant
Section 1524(a) doesn’t give police open-ended authority. It enumerates the situations where a magistrate is allowed to sign off. In practice, the grounds fall into a handful of recurring categories.1California Legislative Information. California Code PEN 1524
Evidence and instruments of crime. A warrant may issue when police believe evidence of a felony will be found at a specified location, when property was stolen or embezzled, when items were used to commit a felony, or when someone possesses items they intend to use in a future offense. This is the classic scenario: drugs, weapons, financial records, or other physical evidence believed to be inside a home, car, or business.
Firearms in domestic violence and protective-order cases. Officers can seek a warrant to seize guns or deadly weapons found at the scene of a domestic violence incident involving threats or physical assault. Warrants also cover firearms held by someone subject to a family court protective order who has failed to surrender them, and firearms held by individuals committed to certain mental health treatment programs.
Electronic records held by providers. When an electronic communication or cloud computing provider holds records showing property was stolen, or that someone possesses items intended for use in a misdemeanor offense, a warrant can compel the provider to produce those records.
Tracking devices. A warrant may authorize installing and monitoring a tracking device when the resulting data would tend to show a felony, or certain Fish and Game or Public Resources Code misdemeanors, has been committed.
DUI and BUI blood draws. When a suspected drunk driver refuses or fails to complete a blood test required under the Vehicle Code, a warrant can authorize a blood draw performed in a medically approved manner.2California Legislative Information. California Code Penal Code 1524 A parallel provision covers boating-under-the-influence investigations under the Harbors and Navigation Code.
Outstanding arrest warrants. If an arrest warrant is already in existence, that alone is a ground for a search warrant to look for the person at a specified location.
What the Officer Has To Show
A magistrate can’t issue a warrant on a hunch. The officer must submit a written affidavit, signed under penalty of perjury, laying out specific facts that establish probable cause — a fair probability that a search of the identified place will turn up evidence of a crime. That standard flows from the Fourth Amendment and is built into California’s statutory framework.3Legal Information Institute. Probable Cause The magistrate may also examine the officer and any witnesses under oath.4California Legislative Information. California Code PEN 1526
Affidavits typically rely on direct observation, surveillance, witness accounts, or confidential informants, and they need to explain why the sources are credible. Vague suspicion doesn’t get a warrant signed.
Once probable cause is found, the warrant itself has to identify the person or place to be searched and describe the specific property or items to be seized. Under Penal Code 1528, the magistrate signs the warrant and directs a peace officer to carry out the search and hold any seized items subject to the court’s order.5California Legislative Information. California Penal Code 1528 The particularity requirement traces back to the Fourth Amendment and is designed to prevent open-ended rummaging.6Justia Law. Fourth Amendment – Particularity
Officers don’t have to appear in person. Under section 1526, the proposed warrant and affidavit can be sent by fax, email, or through a computer server; the officer signs digitally and the magistrate signs and transmits the warrant back. The version the officer receives counts as the original. In time-sensitive situations, a magistrate can accept an oral statement under oath instead of a written affidavit, as long as it’s recorded and later transcribed into the file.
Special Procedures for Lawyers, Doctors, and Clergy
One of the more distinctive parts of section 1524 is its special master requirement. When police want to search for documents held by a lawyer, doctor, psychotherapist, or member of the clergy who is not personally suspected of criminal activity related to the evidence, the court must appoint a special master to accompany the officers.
The special master informs the person served of exactly what is being sought and gives them a chance to hand the items over voluntarily. If the person doesn’t cooperate, the special master conducts the search. When the person served claims that certain items are privileged, those items are sealed and taken to court for a hearing. At the hearing, the professional can argue both that the search was unlawful and that the materials are protected by privilege. The court must hold the hearing within three days of the warrant’s service unless that timing is impracticable.
Service should happen during normal business hours whenever possible, and it should be made on the person who appears to have possession or control of the items. If that person can’t be located after reasonable efforts, the special master seals anything that looks privileged and returns it to the court for review.
Warrants for Phones, Cloud Data, and Other Digital Records
California’s protection for digital privacy goes further than federal law. The California Electronic Communications Privacy Act, at Penal Code sections 1546 through 1546.4, generally prohibits a government entity from accessing your device data, compelling electronic communications from a service provider, or physically interacting with your device to extract information without a warrant.7California Legislative Information. California Penal Code 1546.1
The exceptions are narrow:
- The device’s authorized possessor gives specific consent, or the owner consents when the device has been reported lost or stolen.
- The government entity has a good-faith belief that an emergency involving danger of death or serious physical injury requires immediate access.
- A separate wiretap order has been issued under the appropriate statutory provisions.
Subpoenas can compel electronic communications from a service provider only if the information is not sought for a criminal investigation or prosecution. For nearly any law enforcement request that touches a phone, a message stored with a carrier, or cloud storage, the default is a warrant.
How a Warrant Gets Executed
Ten-Day Life
A search warrant must be executed and returned within 10 days of issuance. Miss that window and the warrant is void. Once executed, the court records related to the warrant become public judicial records; until execution or expiration, those records can remain sealed.8California Legislative Information. California Penal Code 1534
Daytime Hours, With Exceptions
Unless the warrant says otherwise, officers can only serve it between 7:00 a.m. and 10:00 p.m. A magistrate may authorize nighttime service on a showing of good cause, and the statute directs the magistrate to weigh officer safety and public safety when deciding.9California Legislative Information. California Penal Code 1533
Knock and Announce
Under Penal Code 1531, an officer executing a search warrant at a home must give notice of authority and purpose before forcing entry. If the officer announces and is refused admittance, the officer can break open doors, windows, or anything else necessary to get inside.10California Legislative Information. California Penal Code 1531 Courts have carved out exceptions when officers reasonably believe someone inside will destroy evidence, react violently, or when police are in active pursuit. The occupants’ criminal records alone are not enough.
Tracking Device Rules Are Different
Tracking device warrants have their own procedure under section 1534(b). The warrant must identify the person or property being tracked and set a time limit of no more than 30 days, though a court can grant extensions in 30-day increments for good cause. Officers must install the device within 10 days of issuance, during daytime hours unless the judge specifically authorizes nighttime installation, and the device can only be installed and used within California. Within 10 calendar days after tracking ends, the officer must file a return with the court and notify the person tracked. Officers are not required to knock and announce before installing a tracking device.
Seized Property
All property taken under a warrant is retained by the officer and held subject to the court’s order. The officer returns the warrant to the issuing court along with an inventory of what was seized.11California Legislative Information. California Code Penal Code 1536
Challenging a Warrant Issued Under Section 1524
The Motion To Suppress
If you believe evidence was obtained through an unlawful search, the primary pretrial remedy is a motion to suppress under Penal Code 1538.5. It asks the court to exclude the evidence and, in some cases, to return illegally seized property. It’s the exclusive pretrial vehicle for challenging unreasonable searches in California criminal cases.12California Legislative Information. California Code PEN 1538.5
Common grounds for challenging a warrant-based search include:
- The warrant was defective on its face.
- Officers took property not described in the warrant.
- Probable cause was lacking and the warrant should not have been issued.
- Officers executed the warrant in a way that violated constitutional standards.
Timing depends on the charge. For misdemeanors, the motion must be made and heard before trial at a special hearing. For felonies, it can be raised at the preliminary hearing or at a separate suppression hearing, and if the motion is denied at the preliminary hearing the defense can renew it later. If the court denies the motion at a special hearing, the defendant has 30 days to seek appellate review through a writ of mandate or prohibition.
The burden shifts depending on whether a warrant existed. In a warrantless search, the prosecution has to prove the search was reasonable. When officers had a warrant, the defendant bears the burden of proving it was defective or improperly executed.
Attacking the Affidavit: Franks Hearings
Sometimes the problem isn’t the search but the sworn statement behind it. Under Franks v. Delaware, a defendant can challenge the truthfulness of statements in the affidavit. To get a hearing, the defense must show that the officer who signed the affidavit deliberately lied or acted with reckless disregard for the truth about something material. “Reckless disregard” means the officer entertained serious doubt about the accuracy of what they wrote. If the defense meets that threshold and the remaining truthful content is insufficient to establish probable cause, the warrant falls and the evidence gets suppressed.13Office of Justice Programs. Misstatements in Affidavits for Warrants – Franks and Its Progeny
The Franks rule reaches false statements by the affiant officer or a fellow officer. An informant’s misrepresentation, standing alone, will not invalidate the warrant. The officer is expected to vet information before swearing to it, but an officer who reasonably relied on a source that turned out to be wrong hasn’t necessarily acted recklessly.