People v. Meza | California Geofence Warrants & Fourth Amendment

Executive Summary

The Case in One Paragraph

Los Angeles County Sheriff's Department detectives investigated the murder of Adbadalla Thabet after surveillance video showed two suspect vehicles appearing at multiple locations associated with Thabet on the day he was killed. Investigators obtained a geofence warrant directing Google to search Location History information for devices present within six geographic areas during specified periods. The process initially produced anonymized device identifiers. Investigators selected eight devices for identifying information, and subsequent warrants tied two Google accounts to Daniel Meza and Walter Meneses. The California Court of Appeal held that the warrant satisfied the California Electronic Communications Privacy Act because it described the electronic information sought with adequate statutory particularity. The court nevertheless found a Fourth Amendment violation. The warrant authorized searches affecting anyone within several substantial geographic areas without particularized probable cause as to each person and allowed investigators excessive discretion in deciding which anonymous users Google would identify. Even so, the court affirmed because the officers reasonably relied on a magistrate-approved warrant at a time when published authority on geofence warrants was essentially nonexistent.

Core Rule A geofence warrant may comply with CalECPA yet still violate the Fourth Amendment. In Meza, the warrant was impermissibly overbroad and insufficiently particular because it swept in location information belonging to numerous unidentified persons without individualized probable cause and left investigators substantial discretion over whose identities would ultimately be disclosed.

Key Holdings at a Glance

CalECPA Was Satisfied The court held that the warrant adequately described the electronic information sought for purposes of California's statutory electronic-privacy requirements.

Fourth Amendment Still Failed Statutory compliance did not cure the separate constitutional problems of overbreadth and insufficient particularity.

Six Geofences Swept Broadly The warrant authorized Google to identify devices found within multiple geographic areas associated with the victim and suspect vehicles.

Innocent Users Were Exposed Some boundaries encompassed residences and other locations where uninvolved people could predictably be present.

Investigator Discretion Was Too Broad The warrant allowed law enforcement to decide which anonymized devices were relevant and obtain identifying information without returning for additional judicial approval.

Good Faith Saved the Evidence Because geofence warrants were novel and published authority was lacking in 2019, the officers' reliance on the magistrate's approval was objectively reasonable.

The Murder Investigation

Thabet was murdered on March 1, 2019. Investigators collected surveillance video from locations associated with his movements and identified two vehicles they believed were connected with the perpetrators.

The vehicles appeared at multiple points associated with Thabet during the day. Investigators inferred that the suspects may have been communicating by cellphone or using their devices for navigation while moving between the relevant locations.

Because detectives did not yet know the identities of the suspected killers or the specific devices they used, they sought location information through a reverse-location warrant directed to Google.

Why a Geofence Was Used The investigative problem was not locating a known suspect's phone. Investigators knew where the crime-related activity had occurred but did not yet know which devices or accounts belonged to the perpetrators. The warrant used location data to move from known places toward unknown suspects.

The Six-Location Geofence Warrant

A Los Angeles Superior Court judge signed the geofence warrant on March 21, 2019. The warrant identified six geographic search areas tied to locations where investigators had observed the victim or suspect vehicles.

The warrant directed Google to search stored Location History records for devices that fell within those areas during specified time windows.

The areas varied in size and context. One search area surrounding Thabet's apartment complex covered approximately seven and one-half acres for a 75-minute early-morning period. The court found that the boundary encompassed not merely the path or location associated with the suspect vehicles but the apartment complex and surrounding buildings.

The warrant therefore had the potential to capture location information associated with people who had no connection to the murder and were simply present within their homes or elsewhere inside the defined area.

Geographic Precision Drawing a digital boundary around the place where criminal activity occurred does not itself establish probable cause to search the location information of every person whose device happens to fall inside the boundary.

The Google Geofence Process

The warrant contemplated a staged disclosure process.

Initial Anonymous Device Data

Google first searched its Location History data for devices that appeared within the geographic and temporal boundaries and returned anonymized identifiers with associated location information.

Investigative Narrowing

Detectives reviewed the anonymous results and determined which devices they believed were relevant based on movement across the geofence locations and other investigative considerations.

Identification

The warrant authorized investigators to obtain identifying information from Google for devices they selected as relevant without obtaining a new warrant or additional judicial authorization.

Investigators ultimately requested identifying information for eight devices. Google provided associated email addresses, and subsequent warrants directed at two accounts eventually led investigators to Meza and Meneses.

Why the Stages Matter A staged process can reduce what investigators initially see, but it does not automatically cure constitutional defects. Courts may examine who or what the provider must search at the first stage and how much discretion investigators retain at later stages.

Probable Cause and Reverse Identification

The superior court found probable cause because surveillance footage showed the two suspect vehicles repeatedly appearing at relevant locations, supporting an inference that the occupants were using phones to communicate or navigate.

The Court of Appeal's concern was different. Even accepting probable cause to believe the perpetrators possessed devices whose location information might be useful, that did not necessarily create probable cause to obtain information associated with every device appearing within the six areas.

This distinction separates probable cause to believe relevant digital evidence exists from probable cause sufficiently tied to the persons or records subjected to search.

Probable-Cause Principle The government's reason to believe the perpetrators used cellphones did not provide particularized probable cause as to every unidentified person whose device happened to appear inside the geofence areas.

Why the Warrant Lacked Particularity

The Fourth Amendment requires a warrant to particularly describe the place to be searched and the persons or things to be seized. Particularity prevents officers from deciding for themselves, after a search begins, what or whom the warrant should cover.

Meza concluded that the warrant provided investigators excessive discretion after Google returned the initial anonymized dataset. Investigators themselves decided which devices were sufficiently relevant to justify obtaining subscriber-identifying information.

The warrant did not require investigators to return to the magistrate and demonstrate probable cause regarding those specific devices before unmasking their users.

Judicial Control A warrant should not transfer a constitutionally significant narrowing decision from the magistrate to investigators without adequate standards. The more discretion officers retain after an initial bulk disclosure, the stronger the particularity concern.

Why the Warrant Was Overbroad

Overbreadth concerns whether probable cause supports the scope of what the warrant authorizes. The Meza court concluded that the six geofence areas swept more broadly than the probable cause established.

The apartment geofence illustrated the problem. The boundary covered approximately seven and one-half acres for 75 minutes in the early morning and included an apartment complex and surrounding buildings. Nothing showed that the suspects had entered every portion of that area or that all devices inside it were likely to belong to participants in the murder.

The warrant therefore authorized collection affecting individuals whose only connection to the investigation was physical presence inside a geographic boundary.

Breadth Versus Particularity Overbreadth asks whether probable cause justifies the scope of the search. Particularity asks whether the warrant sufficiently limits what officers or providers may search and seize. Meza found problems with both.

Why the Warrant Still Complied with CalECPA

Meza is particularly important for California agencies because the defendants separately argued that the warrant violated the California Electronic Communications Privacy Act, Penal Code section 1546 et seq.

CalECPA imposes statutory requirements on warrants seeking electronic information, including requirements concerning particular description of the information to be seized and handling of unrelated information.

The Court of Appeal concluded that the geofence warrant met CalECPA's statutory requirements. The electronic information sought was described sufficiently for purposes of the statute.

But the court refused to treat statutory compliance as the end of the analysis. CalECPA itself requires warrants for electronic information to comply with other California and federal law, including constitutional warrant requirements.

California Practice Rule CalECPA compliance and Fourth Amendment compliance are separate inquiries. A warrant can satisfy California's electronic-information statute and still be unconstitutional because it is overbroad or insufficiently particular.

Why the Good-Faith Exception Applied

Although the Court of Appeal found the geofence warrant unconstitutional, it refused to suppress the evidence under United States v. Leon.

The warrant was issued in March 2019, when geofence warrants were relatively new. The court noted the lack of published authority directly addressing their constitutionality. Investigators had prepared an affidavit, presented the request to a magistrate, and obtained judicial approval.

The court concluded that officers were not objectively unreasonable in relying on the warrant even though closer constitutional review revealed significant defects.

Remedial Holding Because the technology was novel, governing precedent was sparse, and investigators obtained judicial authorization, the Leon good-faith exception prevented suppression despite the Fourth Amendment violation.

Good Faith Is Time Sensitive Meza's good-faith holding arose from the state of the law in 2019. As appellate decisions accumulate, investigators cannot assume that reliance on older geofence practices will remain objectively reasonable.

What Meza Does—and Does Not—Establish

Meza is published California appellate authority.
It held the particular geofence warrant unconstitutional under the Fourth Amendment.
It held that the warrant nevertheless satisfied CalECPA.
It does not hold that every geofence warrant is categorically unconstitutional.
It does not hold that geographic and temporal limitations are irrelevant. Rather, the limits in this warrant were insufficiently tied to particularized probable cause.
It does not treat anonymization as a complete constitutional cure.
It identifies investigator discretion in deciding which anonymous devices to unmask as an important particularity problem.
Its good-faith ruling does not validate the warrant. The warrant was unconstitutional even though the evidence remained admissible.
Its good-faith analysis reflects the sparse state of geofence precedent in 2019 and should not be mechanically applied to later searches.
California agencies must analyze both CalECPA and the Fourth Amendment.

Meza Compared with Other Geofence Decisions

Case	Warrant Treatment	Central Lesson
People v. Meza	Unconstitutional	Overbroad and insufficiently particular; CalECPA satisfied; good faith prevented suppression.
Price v. Superior Court	Upheld on materially narrower facts	Shows how tighter geographic, temporal, and investigative limitations can alter the California analysis.
United States v. Smith	Unconstitutional	Fifth Circuit characterized the geofence process as an unconstitutional general warrant but applied good faith.
United States v. Chatrie	Major federal geofence litigation	Addresses location privacy and reverse-location warrant architecture under the Fourth Amendment.
Carpenter v. United States	Historical CSLI protected	Recognizes significant Fourth Amendment privacy in stored cellphone location information.
United States v. Leon	Suppression doctrine	Objectively reasonable reliance on a judicial warrant may preserve evidence even when the warrant is later invalidated.

Agency Operations Checklist

Establish why a reverse-location search is necessary. Explain why conventional investigative techniques cannot adequately identify the unknown suspect.
Connect the device inference to facts. Explain why there is reason to believe the perpetrator possessed and used a relevant device at the location.
Draw the smallest defensible geography. Do not include entire residential complexes, neighboring buildings, or unrelated areas without factual justification.
Use the shortest defensible time period. Tie the window to surveillance, witness information, access records, video, or other evidence establishing when the suspect was present.
Identify innocent-user exposure. Consider homes, apartments, businesses, roads, schools, hospitals, religious facilities, and other sensitive locations within the proposed boundary.
Define each disclosure stage. Specify what the provider may disclose initially and what additional information may be obtained later.
Constrain investigative discretion. Establish objective criteria for narrowing anonymous devices rather than leaving relevance wholly to investigator judgment.
Consider returning to the magistrate before unmasking users. Additional judicial review can strengthen particularity where investigators move from anonymous data to identifiable accounts.
Address CalECPA expressly. California applications should separately identify statutory and constitutional compliance.
Check current controlling precedent. Meza's 2019 good-faith rationale should not be treated as permission to repeat a warrant structure later found constitutionally deficient.
Preserve provider disclosures and narrowing decisions. Maintain the initial anonymous dataset, search parameters, investigative notes, selection criteria, subscriber requests, and resulting warrants.
Corroborate before treating a device as a suspect. Presence inside a geofence is an investigative lead, not proof that the user committed the offense.

Litigation and Review Checklist

Map each geofence boundary precisely.
Identify the factual basis supporting each geographic area.
Identify the factual basis supporting each time window.
Determine how many uninvolved persons or residences were likely included.
Determine how many devices Google searched and how many identifiers were returned.
Identify the criteria investigators used to narrow the anonymous devices.
Determine whether the warrant itself contained those criteria.
Determine whether investigators returned to a magistrate before obtaining subscriber identities.
Analyze probable cause, breadth, and particularity separately.
Analyze CalECPA compliance separately from federal constitutional compliance.
Determine the state of controlling law on the date the warrant was issued.
Analyze Leon good faith separately from validity of the warrant.
Trace whether later warrants had independent probable cause or depended materially on geofence-derived evidence.

Frequently Asked Questions

Did Meza hold that the geofence warrant was unconstitutional?

Yes. The California Court of Appeal concluded that the warrant lacked Fourth Amendment particularity and was impermissibly overbroad.

Was the evidence suppressed?

No. The court applied the Leon good-faith exception because officers had obtained judicial approval when geofence technology was novel and published authority directly addressing the technique was scarce.

Did the warrant violate CalECPA?

No. The court concluded that the warrant satisfied CalECPA's statutory requirements even though it failed the separate Fourth Amendment analysis.

How many geographic areas were searched?

The warrant identified six geofence areas associated with locations relevant to the victim and suspect vehicles.

Why was the apartment geofence problematic?

One area covered approximately seven and one-half acres around the victim's apartment complex for a 75-minute early-morning period, potentially exposing location information for numerous residents and other uninvolved people without individualized probable cause.

Why was particularity inadequate?

Among other concerns, the warrant gave investigators substantial discretion to determine which anonymous devices were relevant and then obtain identifying information without additional judicial process.

Does Meza prohibit all geofence warrants in California?

No. The decision invalidated the warrant before it. The later California decision in Price v. Superior Court demonstrates that materially narrower geofence warrant facts can produce a different result.

Can agencies rely on Meza's good-faith ruling today?

Not automatically. Good faith depends on what a reasonably trained officer could understand from the law existing when the warrant is sought. Later precedent reduces the ability to rely on the novelty that existed in 2019.

Does a warrant satisfying CalECPA necessarily satisfy the Fourth Amendment?

No. Meza expressly demonstrates that statutory compliance and constitutional compliance are separate questions.

Primary Authorities and Related Law

People v. Meza, 90 Cal. App. 5th 520 (2023)
Published California Court of Appeal decision holding that the geofence warrant violated the Fourth Amendment but satisfied CalECPA, with suppression denied under the good-faith exception.
Read People v. Meza

California Electronic Communications Privacy Act, Penal Code § 1546 et seq.
California statutory framework governing law-enforcement access to electronic communication information and electronic device information.
Read CalECPA

Carpenter v. United States, 585 U.S. 296 (2018)
Supreme Court decision recognizing Fourth Amendment protection for qualifying historical cellphone location information.
Read Carpenter v. United States

United States v. Leon, 468 U.S. 897 (1984)
Supreme Court decision establishing the good-faith exception for objectively reasonable reliance on a judicial warrant.
Read United States v. Leon

Price v. Superior Court, 93 Cal. App. 5th 13 (2023)
California Court of Appeal decision addressing a more narrowly constructed geofence warrant and providing an important comparison to Meza.
Read Price v. Superior Court

Final Assessment

People v. Meza is one of the most operationally useful California geofence decisions because it separates three questions that can easily be blurred together: whether investigators have probable cause to believe useful location information exists, whether the warrant's scope and procedures satisfy the Fourth Amendment, and whether the warrant complies with CalECPA.

The court found that the investigation supplied a plausible basis for believing the perpetrators used cellphones while moving among locations connected with the murder. That did not, however, justify exposing location information associated with every person inside multiple substantial search areas or leaving investigators broad discretion to decide whose anonymous records would later be unmasked.

Meza also provides an important warning about good faith. The evidence survived because investigators acted in 2019, when geofence warrants were novel and published appellate authority was essentially nonexistent. That historical context cannot be separated from the result. As courts provide more guidance, agencies are increasingly expected to incorporate that guidance into warrant design.

Shield Practice Rule For California geofence investigations, analyze CalECPA and the Fourth Amendment separately. Tie every geographic boundary and time period to specific facts, minimize exposure of uninvolved users, constrain post-disclosure investigator discretion, consider renewed judicial approval before identifying anonymous devices, and do not rely on the novelty-based good faith that preserved the evidence in Meza.