California Penal Code 1524: Warrant Grounds and Procedure

California Penal Code section 1524 is the statute that lists the specific circumstances in which a California judge may issue a search warrant. It names more than a dozen grounds, from stolen property and felony evidence to firearms seized at a domestic violence scene, data held by electronic communication providers, DUI blood draws, and tracking devices. It also builds in a distinctive protection: when the search targets records held by a lawyer, doctor, psychotherapist, or clergy member who isn’t personally suspected, a court-appointed special master has to go along.¹

Grounds a Judge Can Issue a Warrant For

Section 1524(a) is not a general grant of search authority. A magistrate can issue a warrant only when one of the listed grounds applies. In practice, those grounds fall into a handful of categories.

Evidence and Instruments of Crime

The classic grounds cover stolen or embezzled property, property used as the means of committing a felony, property in someone’s possession with intent to use it to commit a public offense, and evidence that tends to show a felony has been committed or that a particular person has committed one.¹ This is the authority officers rely on when they want to search a home, vehicle, or business for drugs, weapons, financial records, or similar evidence.

Firearms Grounds

Several subdivisions deal specifically with firearms. A warrant may issue to seize firearms or deadly weapons at the scene of a domestic violence incident involving a threat to human life or physical assault, firearms in the possession of 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.¹

Electronic Records

When an electronic communication or cloud computing service holds records showing that property was stolen or that someone possesses items they intend to use in a misdemeanor offense, a warrant can compel the provider to produce those records.¹ This ground works alongside the broader California Electronic Communications Privacy Act at Penal Code sections 1546 through 1546.4, which generally requires a warrant before any government entity accesses electronic device data, compels communications from a service provider, or physically interacts with a device to extract information. The main CalECPA exceptions are specific consent from the authorized possessor, a good-faith emergency involving death or serious physical injury, and a separate wiretap order.²

Tracking Devices

A warrant may authorize installing and monitoring a tracking device when the resulting information would tend to show that a felony, or certain Fish and Game or Public Resources Code misdemeanors, have been committed.¹ The execution rules for these warrants live in section 1534(b), covered below.

DUI and BUI Blood Draws

When a person suspected of driving under the influence refuses or fails to complete a blood test required by the Vehicle Code, a warrant can authorize a blood draw performed in a medically approved manner. A parallel provision covers boating-under-the-influence investigations under the Harbors and Navigation Code.³

Outstanding Arrest Warrants

If a valid arrest warrant exists, that alone is a ground for issuing a search warrant to locate the person at a specified place.¹

The Special Master Requirement for Privileged Searches

The feature that sets section 1524 apart from most warrant statutes is its treatment of searches aimed at documents held by professionals bound by privilege. When police want to search for items in the possession of a lawyer, physician, psychotherapist, or clergy member who is not personally a suspect in the related criminal activity, a standard warrant is not enough. The court must appoint a special master to accompany the officers during the search.¹

The special master is the one who first informs the person served of what is being sought and gives them an opportunity to produce the items voluntarily. If the person does not cooperate, the special master conducts the search. If the person claims that certain items are privileged, those items are sealed and taken to court for a hearing. At that hearing, the professional can argue both that the search itself was unlawful and that the materials are protected by privilege. The court must hold the hearing within three days of service unless that timeline is impracticable.¹

Service must take place during normal business hours whenever possible, and the warrant should be served on the person who appears to have possession or control of the items. If that person cannot be located after reasonable efforts, the special master seals anything that appears privileged and returns it to the court for review.¹

How 1524 Works With the Rest of the Warrant Statutes

Section 1524 says when a warrant can issue. Other sections of the Penal Code say how.

Probable Cause and the Affidavit

A magistrate can issue a warrant only on a finding of probable cause, meaning a fair probability that evidence of a crime will be found at the specified place.⁴ Under Penal Code 1526, the officer seeking the warrant has to supply a written affidavit, signed under penalty of perjury, setting out specific facts. The magistrate can also examine the officer and any witnesses under oath. Vague suspicion isn’t enough; the affidavit normally rests on direct observation, surveillance, witness statements, or informant information with an explanation of why the source is credible.⁵

Section 1526 also lets officers transmit a proposed warrant and supporting affidavits by fax, email, or through a computer server, with digital signatures on both ends. The copy the officer receives back is treated as the original. In time-sensitive situations, a magistrate may accept an oral statement under oath, recorded and later transcribed, in place of a written affidavit.⁵

What the Warrant Must Say

Once probable cause is found, the warrant itself must identify the person or place to be searched and the specific property or items to be seized. Under Penal Code 1528, the magistrate signs the warrant and directs a peace officer to carry it out and retain any seized items subject to the court’s order.⁶ The particularity requirement comes from the Fourth Amendment and is designed to prevent the open-ended rummaging that colonial general warrants allowed.⁷

Execution Deadlines

A search warrant must be executed and returned within 10 days of issuance. If it isn’t served in that window, the warrant becomes void. Court records tied to the warrant become public judicial records once it is executed; before that, they can remain sealed.⁸

Tracking device warrants have their own execution rules 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, with extensions available in 30-day increments on a showing of good cause. The device has to be installed within 10 days of issuance, during daytime hours unless the judge specifically authorizes nighttime installation, and it may only be installed and used within California. Within 10 calendar days after the tracking ends, the executing officer must file a return and notify the person tracked.⁸

Daytime Service and Knock and Announce

Unless the warrant says otherwise, officers can serve it only between 7:00 a.m. and 10:00 p.m. A magistrate can authorize nighttime service on a showing of good cause, with the statute directing the magistrate to weigh officer and public safety when deciding.⁹ Under Penal Code 1531, an officer executing a warrant at a residence has to give notice of authority and purpose before forcing entry; if admittance is refused after announcement, the officer may break open doors, windows, or any other obstacle.¹⁰ Courts recognize exceptions when officers reasonably believe evidence will be destroyed, occupants will react violently, or police are in active pursuit, but criminal history alone, without more, is not enough.

Seized Property

All property taken under the warrant is retained by the officer subject to the court’s order. The officer returns the warrant to the issuing court with an inventory of what was seized, and the court with jurisdiction over the underlying offense can also issue orders regarding the property.¹¹

Challenging a Warrant Issued Under 1524

If you believe officers searched you or your property under a defective warrant, the primary pretrial remedy is a motion to suppress under Penal Code 1538.5. The motion asks the court to exclude the evidence and, in some cases, to return property that was unlawfully seized. Section 1538.5 is the exclusive pretrial route for challenging unreasonable searches in California criminal cases.¹²

A warrant-based search can be challenged on several grounds:

The warrant was defective on its face.
Officers seized property not described in the warrant.
The warrant should not have been issued because probable cause was lacking.
The warrant was executed 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, the defense can raise it at the preliminary hearing or at a separate suppression hearing, and if denied at the preliminary hearing it can be renewed later. If a special hearing ends in denial, the defendant has 30 days to seek appellate review by writ of mandate or prohibition.¹²

One detail is easy to miss. When officers searched without a warrant, the prosecution has the burden of proving the search was reasonable. When a warrant was in hand, the burden flips: the defendant has to prove the warrant was defective or improperly executed.¹²

Where the problem is the affidavit itself, a separate challenge is available under Franks v. Delaware. 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, meaning the officer entertained serious doubt about the accuracy of what was written. If that threshold is met and the remaining truthful content of the affidavit cannot support probable cause, the warrant falls and the evidence is suppressed. The rule reaches false statements by the affiant or a fellow officer; an informant’s misrepresentation standing alone will not invalidate the warrant.¹³

1
California Legislative Information. California Code PEN 1524
2
California Legislative Information. California Penal Code 1546.1
3
California Legislative Information. California Code Penal Code 1524
4
Legal Information Institute. Probable Cause
5
California Legislative Information. California Code PEN 1526
6
California Legislative Information. California Penal Code 1528
7
Justia Law. Fourth Amendment – Particularity
8
California Legislative Information. California Penal Code 1534
9
California Legislative Information. California Penal Code 1533
10
California Legislative Information. California Penal Code 1531
11
California Legislative Information. California Code Penal Code 1536
12
California Legislative Information. California Code PEN 1538.5
13
Office of Justice Programs. Misstatements in Affidavits for Warrants – Franks and Its Progeny