State v. Sylvestre
The Florida appellate decision distinguishing carrier-provided CSLI from direct Stingray surveillance and requiring a separate warrant.
Executive Summary
Investigators obtained orders requiring a cellphone provider to disclose historical and real-time cell-site location information and to install a pen register and trap-and-trace device. Provider data narrowed Quinton Sylvestre’s phone to several city blocks but could not identify a precise address. Without obtaining separate judicial authorization, an officer deployed a cell-site simulator and pinpointed the phone inside a Fort Lauderdale residence. Police then relied on that precise location in an affidavit for a residential search warrant and recovered firearms, a mask, ammunition, and a stun gun. The Florida Fourth District Court of Appeal held that the provider-directed orders did not authorize officers to operate a simulator. Carrier disclosure was indirect surveillance; simulator deployment was direct government surveillance that actively caused the phone to reveal its location. Applying Carpenter and related authority, the court held that probable cause and a warrant were required and affirmed suppression.
Key Holdings at a Glance
Investigation and Residential Search
Sylvestre and two co-defendants were charged in connection with a Boca Raton restaurant robbery involving firearms and masks. Investigators associated a phone number with Sylvestre and sought court-ordered location assistance.
The provider’s tower information placed the phone only within a general area covering several square blocks. An officer then used a simulator to identify the specific residence where the phone remained overnight. A later search-warrant affidavit stated that lawful mobile tracking had placed the phone specifically at that residence. During the resulting search, detectives found a backpack containing three firearms, a mask, ammunition, and a stun gun.
What the Existing Orders Authorized
| Process | Authorized Actor and Conduct | What It Did Not Authorize |
|---|---|---|
| CSLI order | Required the service provider to disclose cell-site activations, sectors, call-detail location records, angle data, and real-time and historical records | Independent police operation of a simulated cell tower |
| Pen register / trap and trace | Required provider installation and transmission of dialing, routing, addressing, or signaling information | Forced direct connections between nearby phones and government equipment |
| Residential search warrant | Authorized the later physical search of the identified residence | Could not automatically cleanse the prior unauthorized location search that supplied the address |
How the Simulator Changed the Investigation
A simulator—also called a StingRay, Hailstorm, or TriggerFish—mimics a provider tower and causes nearby phones to transmit identifying signals. Operators use those signals and relative strength to narrow the location of a known device.
In Sylvestre, carrier data could identify only a multi-block area. The simulator supplied the precision needed to select one residence. That difference was not merely quantitative; the police became the collector and induced the target device to communicate directly with government equipment.
Direct and Indirect Government Surveillance
The court’s central distinction was between compelling a third party to disclose records already in its possession and deploying government equipment that creates a new communication with the target phone.
The provider could not deliver the required address-level precision. Officers therefore resorted to another method. Because that method was not described or authorized, the deployment exceeded the orders’ scope.
Carpenter and the Warrant Requirement
The court relied on the Supreme Court’s recognition in Carpenter v. United States that deeply revealing cellular location records ordinarily require a warrant. It reasoned that if historical CSLI held by a third party receives Fourth Amendment protection, there was no sound basis to exempt the more invasive direct use of a simulator.
The technique enabled real-time precision without provider mediation. Absent an established exception, the government had to establish probable cause and obtain court authorization before using it.
Locating the Phone Inside a Home
The simulator did not simply reveal movement along public roads. It identified a specific residence in which the phone remained. The home receives the Fourth Amendment’s highest protection, and technology that reveals information unavailable without physical entry presents the concerns recognized in Kyllo, Karo, and Lambis.
The court also noted that precise location can reveal attendance at other sensitive places beyond public thoroughfares, such as medical offices or political headquarters.
Why Probable Cause Alone Was Not Enough
The CSLI order itself was supported by probable cause, but that did not validate every investigative technique officers might use to locate the phone. The Fourth Amendment requires authorization for the place, information, and method actually searched.
Derivative Evidence and Suppression
The precise residential location came from unauthorized simulator deployment and was used to obtain the physical search warrant. The appellate court affirmed suppression of the evidence discovered through that sequence.
The case illustrates a classic derivative-evidence problem: a later warrant does not automatically cure an earlier unlawful search when the affidavit depends on the unlawfully obtained information.
Current Significance
Sylvestre is a state intermediate-appellate decision and must be applied with controlling law in the relevant jurisdiction. Its operational lesson is nevertheless broad: statutes and orders written for provider-held records should not be stretched to cover direct government collection through materially different equipment.
Current practice should account for post-Carpenter location doctrine, state constitutional privacy protections, electronic-surveillance statutes, warrant rules, provider requirements, and agency policy.
Simulator Warrant Checklist
- Identify the target device and the factual nexus to the offense.
- Describe why provider data or conventional surveillance is insufficient.
- Explain that the simulator mimics a tower and induces nearby phones to respond.
- Identify every category of signaling information collected.
- Define geography, duration, activation limits, power, precision, and stopping conditions.
- Address use near homes and other sensitive locations.
- Prohibit content interception unless separately authorized.
- Limit access to non-target data and require prompt, verifiable deletion.
- Require logs, operator records, return information, and preservation for discovery.
Agency Operations Checklist
- Confirm that the warrant expressly authorizes simulator use—not merely CSLI or pen-register process.
- Brief operators on authorized device, target, area, time, data, and purpose.
- Record which facts came from provider records and which came from the simulator.
- Stop when the target is located or authorization expires.
- Protect emergency-call capability and document any service disruption.
- Segregate and delete non-target identifiers under policy and warrant terms.
- Preserve technical settings, deployment maps, logs, results, deletion certifications, and downstream uses.
Litigation and Review Checklist
- Obtain every application, affidavit, order, warrant, return, deployment log, and deletion record.
- Separate historical CSLI, real-time provider data, GPS information, pen-register information, and simulator results.
- Compare the order’s authorized actor and conduct with the technique actually used.
- Determine the precision of each source and which source identified the exact place.
- Redact simulator-derived facts from later affidavits and reassess probable cause.
- Trace physical evidence, arrests, statements, and later warrants to the unauthorized deployment.
- Analyze independent source, inevitable discovery, attenuation, and good faith using the actual record.
Frequently Asked Questions
Did police have court orders?
Yes. The orders directed the provider to disclose CSLI and install pen-register and trap-and-trace process, but they did not authorize police to operate a simulator.
Was the CSLI order supported by probable cause?
Yes. The appellate court affirmed that portion of the trial court’s ruling.
Why was the simulator a separate search?
It was direct government surveillance that induced the phone to communicate with police equipment and supplied greater precision than the provider records.
Why did the home matter?
The simulator revealed that the phone was inside a specific residence—information the provider data could not supply and the Fourth Amendment strongly protects.
What was suppressed?
The court affirmed suppression of evidence discovered as a result of the warrantless simulator use, including evidence recovered through the derivative residential search.
Primary Authorities and Related Law
Opinion affirming suppression after warrantless simulator use exceeded provider-directed orders.
Read the complete opinion
Supreme Court decision requiring a warrant for the historical CSLI at issue.
Read Carpenter v. United States
Decision distinguishing a CSLI warrant from unauthorized simulator use.
Read United States v. Lambis
Federal warrant, disclosure, minimization, deletion, and oversight requirements.
Read DOJ policy
Final Assessment
State v. Sylvestre makes authorization method-specific. Probable cause for carrier records cannot be treated as a blank check for police-operated technology that creates new communications, reaches non-target devices, and supplies residence-level precision.