The Shield Summary Newsletter — July, 2026
For every agency that uses, or is considering using, geofence warrants, ALPR networks, or cell-site simulators, this decision changes the baseline. On July 8, I'll walk through exactly what agencies need to do now — and into the future — in a dedicated Shield Thursdays webinar, After Chatrie: What the Supreme Court's Geofence Warrant Decision Means for Your Agency. This one is on us — no registration fee.
This issue's "Beyond the Warrant" feature goes a step further than the geofence question alone, addressing the broader category of location and identity technology agencies are deploying today — Flock Safety ALPR networks and cell-site simulators among them — and the constitutional framework now developing around each.
I also want to highlight our growing library of free Shield Micro Lessons — tuition-free, on-demand training covering constitutional law, use of force, internal affairs, criminal investigations, corrections, and AI & emerging technology. See the feature below for details.
Finally, our correctional operations update this month covers a new federal civil rights investigation and a suicide-prevention benchmark every jail administrator should be tracking.
Geofence Warrants Get Their Answer — With Conditions
The Supreme Court closed its term by deciding the most significant Fourth Amendment digital-privacy case since Carpenter v. United States in 2018. Agencies now have a confirmed constitutional floor — but not yet a complete rulebook.
Okello Chatrie was convicted of a 2019 Virginia bank robbery after a geofence warrant directed Google to disclose the identities of cell phone users within a defined radius of the bank during a one-hour window. Writing for a 6-3 majority, Justice Kagan held that an individual has a legitimate expectation of privacy in cell phone location data, and that police "intrude on that constitutionally protected interest" when they demand it from a third-party provider — even for a limited time. The Court did not decide whether the specific warrant in Chatrie's case satisfied the Fourth Amendment's particularity and probable cause requirements; it remanded that question to the Fourth Circuit. Justice Alito, joined in part by Justices Thomas and Barrett, dissented, calling the ruling "an irresponsible escapade" with no practical effect on Chatrie's own conviction.
Practical Impact: Geofence warrants are not categorically prohibited, but agencies must now treat the underlying data request as a Fourth Amendment search requiring a warrant supported by probable cause and particularity as to scope, geographic radius, and duration. Warrant affidavit templates should be reviewed with agency counsel before the next application is filed. Note: Google moved Location History storage on-device in July 2025, which independently limits the availability of the kind of "Sensorvault" data at issue in Chatrie going forward — agencies relying on this data source should confirm current availability with counsel and prosecutors.
After Chatrie: What Agencies Must Do Right Now
Chatrie answers the threshold constitutional question but leaves the operational one open: what does a warrant actually need to say to survive the particularity standard the Court just confirmed applies? Agencies cannot wait for the Fourth Circuit's remand decision to find out — new warrant applications are being drafted today.
The holding is narrow but consequential: acquiring cell phone location data from a third party is a Fourth Amendment search, full stop. The Court left the "reasonableness" analysis — what a warrant must specify about scope, time window, and geographic radius to be constitutionally sound — for the lower courts to work out on remand. That means the current national landscape includes agencies operating under Fourth Circuit guidance still being developed, and other circuits that may reach different particularity standards before the Supreme Court steps back in.
Independent of the constitutional question, Google's July 2025 move of Location History data to on-device storage means the "Sensorvault" database at the center of the Chatrie warrant may no longer hold the volume of historical location data it once did. Agencies should confirm with prosecutors and technical personnel what geofence data is realistically obtainable from Google today before drafting an application modeled on pre-2025 practice.
Chatrie's reasoning — that individuals retain a reasonable expectation of privacy in data revealing their location and movement, even when a third party holds it — is a Fourth Amendment principle, not a rule limited to Google. Agencies deploying automated license plate reader (ALPR) networks, including third-party or regional-sharing platforms, and cell-site simulators, should expect defense counsel to invoke Chatrie's reasoning to challenge warrantless or under-particularized use of those tools as well. The "Beyond the Warrant" feature below addresses this in detail.
The Practical Resolution — Four Points Every Agency Needs Now: (1) Route every geofence, ALPR-network, and cell-site simulator warrant application through agency counsel before filing — do not rely on templates drafted before June 29, 2026. (2) Confirm current data availability with providers; do not assume pre-2025 Sensorvault-style access still exists. (3) Document specific, individualized probable cause for the geographic radius and time window requested — broad or exploratory requests are the most exposed to a particularity challenge. (4) Track the Fourth Circuit's remand decision and any parallel circuit rulings; the operational rulebook is still being written.
Join After Chatrie: What the Supreme Court's Geofence Warrant Decision Means for Your Agency on July 8 — free registration at shieldpst.org.
What Agencies Are Paying — and Why
One recent settlement illustrates a pattern risk managers see repeatedly: an escalation involving a vulnerable individual that produces disability-discrimination exposure layered on top of the underlying use-of-force claim.
The City of Burlington, Vermont agreed to pay $150,000 to settle a civil rights lawsuit filed by the ACLU of Vermont on behalf of a mother whose 14-year-old son, who has a documented history of behavioral and intellectual disabilities, was subjected to force by responding officers after she called police for what she described as "a learning opportunity" following a minor theft. The lawsuit alleged officers escalated the encounter with threats and violence, and that paramedics administered ketamine to the teen before forcibly removing him from the home. A state Superior Court judge had already rejected the city's motion to dismiss, finding the facts supported claims of excessive force, racial discrimination, and disability discrimination. The settlement resolved the case, filed in 2024, without trial. (Settled June 11, 2026.)
Agency Lesson: When a caller discloses a documented disability at the time of the call — as this mother did — that information becomes part of the record any court will later examine in assessing whether the agency's response was reasonable. Dispatch protocols and responding officers both need clear guidance on de-escalation and disability-informed response when a call includes this information up front. Treating a parent's request for help as an occasion for physical intervention, particularly involving a minor with a known disability, converts a manageable call into exactly the kind of layered liability — excessive force plus disability discrimination — that produces settlements like this one.
New Federal Investigations and a Suicide-Prevention Benchmark
Two developments frame this month's correctional update: an active federal civil rights investigation into a state correctional system, and continuing evidence that proactive reform — not reactive litigation response — is the most defensible posture available to agencies.
The Department of Justice's Civil Rights Division has opened a civil investigation into conditions within facilities operated by the Colorado Department of Corrections and the Colorado Division of Youth Services. Under the Civil Rights of Institutionalized Persons Act (CRIPA), the investigation will examine whether DOC and DYS policies and practices afford incarcerated adults and youths in state custody their rights under the Constitution and federal law. The Division will also examine DYS practices under the Violent Crime Control and Law Enforcement Act of 1994. Colorado now joins a growing list of state systems under active CRIPA review.
Practical Impact: A CRIPA investigation does not require a triggering incident — the Division opens investigations based on identified indicators, not solely in response to a lawsuit or crisis event. Correctional administrators in every state should treat an open investigation elsewhere as a signal to conduct an internal compliance review now, before a notice letter arrives. Confirm current policy and practice on use of force, medical and mental health care access, and conditions of confinement against Eighth and Fourteenth Amendment standards, and document that review.
Agencies that adopt suicide-prevention, use-of-force, or conditions-of-confinement reforms before litigation compels them consistently occupy a stronger legal position under the deliberate-indifference standard established in Estelle v. Gamble, 429 U.S. 97 (1976). Under that standard, a plaintiff must show the agency was aware of a serious risk and failed to act reasonably in response. An agency that documents proactive screening, training, and protocol improvements — before an incident, not after — builds a contemporaneous record showing it did not act with deliberate indifference. Agencies waiting for a CRIPA notice or a lawsuit to prompt reform are, in the meantime, building the record a future plaintiff will use against them.
ADA Compliance Remains Independent of Enforcement Climate: Title II of the ADA applies to every county jail and state correctional facility regardless of which administration controls the Department of Justice or whether a CRIPA investigation is currently open in your state. Shield PST's ADA in the Jails symposium, coming in October 2026, provides correctional commanders, jail administrators, and agency counsel the legal framework and practical tools to meet these obligations on your own timeline, not the DOJ's. $795 per attendee · Location to be announced · shieldpst.org
The Next Wave of Chatrie Challenges
Chatrie addressed cell phone location data specifically, but its underlying principle — that individuals retain a reasonable expectation of privacy in data revealing their movements, even when a third party or vendor platform holds it — does not stop at geofence warrants. Two other categories of tools now in widespread use by agencies face the same doctrinal exposure.
Agencies participating in regional or nationwide ALPR data-sharing networks, including vendor-hosted platforms such as Flock Safety, should expect defense counsel to argue that aggregated, retained ALPR data — capable of reconstructing a vehicle's movements over days, weeks, or months — implicates the same privacy interest the Court recognized in Chatrie and, before it, in Carpenter v. United States. Networks that allow one agency to query another agency's camera data, or that retain data for extended periods without individualized suspicion, present the greatest exposure. Agencies should confirm retention periods, cross-agency query authorization requirements, and whether current use complies with any state ALPR-specific statute.
Cell-site simulators ("Stingrays") that canvass an area to identify or locate a target device raise particularity concerns closely analogous to those Chatrie addressed: the device does not discriminate between the target and innocent bystanders' phones within range. Department of Justice policy has required a Rule 41 warrant supported by probable cause for cell-site simulator use in most circumstances since 2015, and several states have independently enacted warrant requirements. Agencies using these devices should confirm their current warrant-application practice reflects both DOJ policy and any applicable state statute, and should specifically document the steps taken to minimize collection from non-target devices.
Many of these tools are deployed through third-party vendor contracts that govern data retention, sharing, and law enforcement access terms the agency itself did not draft. Agency counsel should review vendor agreements for ALPR and cell-site technology to confirm the contract terms align with the agency's own constitutional obligations — not just the vendor's technical capabilities.
The Bottom Line: Chatrie is not the last word on monitoring technology and the Fourth Amendment — it is the first major data point in a doctrine still being built case by case, tool by tool. Agencies that wait for a circuit split to resolve before reviewing their own ALPR and cell-site simulator practices are choosing to litigate that review after a suppression motion, rather than before one. Shield PST's Chatrie briefing materials, including a full case law chart covering ALPR, Flock Safety network litigation, and cell-site simulator authority, are available at shieldpst.org.
Transforming Understanding Into Action — At No Cost
Not every agency has the budget for a symposium or the schedule for a live webinar. That's exactly why we built Shield Micro Lessons — short, practical, tuition-free video training that fits into a briefing, a roll call, or fifteen minutes at a desk.
Shield Micro Lessons are short, focused video trainings — one concept at a time, built for officers, supervisors, investigators, corrections staff, and agency counsel who need practical legal grounding without clearing a full day for a seminar. Register once, and you get unlimited access to our growing library, currently organized across six core areas:
Fourth Amendment search and seizure, qualified immunity, and the doctrinal developments — like Chatrie and Barnes v. Felix — reshaping how agencies operate day to day.
Practical application of current use-of-force doctrine, from the totality-of-circumstances standard to documentation practices that hold up in court.
Investigation fundamentals, procedural safeguards, and the legal framework that keeps internal investigations defensible.
Practical legal grounding for the investigative decisions officers and detectives make in the field, from warrant applications to evidence handling.
Constitutional standards for conditions of confinement, use of force in custody, and the operational practices that reduce CRIPA and Eighth Amendment exposure.
What agencies need to know about AI report-writing tools, geofence warrants, ALPR networks, and cell-site simulators — the legal and operational risks covered throughout this issue.
How to Get Access: Registration is free and takes less than a minute. Once registered, you have unlimited access to the full library, with new lessons added regularly as the law develops.
Access the Micro Lesson Library · shieldpst.org
9:00 AM PDT / 12:00 PM EDT
Nationwide
shieldpst.org
What You Will Learn:
- • What the Supreme Court actually decided in Chatrie v. United States — and what it left open
- • The current status of the Fourth Circuit remand and what to watch for next
- • How the Google Location History storage change affects data availability for future warrants
- • What your geofence warrant applications need to include to satisfy the particularity standard Chatrie confirms applies
- • How Chatrie's reasoning extends to ALPR networks, including Flock Safety and similar platforms
- • Cell-site simulator warrant practice under current DOJ policy and state law
- • Practical steps for reviewing existing warrant templates and vendor contracts with agency counsel
- • What to do with open prosecutions that relied on geofence evidence obtained under prior practice
Questions about this webinar? Contact us at staff@shieldpst.org.
2026 Shield PST Training Calendar
| Date | Event | Location | Type |
|---|---|---|---|
| July8, 2026 |
After Chatrie: Geofence Warrants & Your Agency
Jeb Brown, Esq. · 9:00 AM PDT / 12:00 PM EDT · Free · Register here
|
Online | Webinar |
| July30, 2026 |
MAT & ADA in Corrections
Kathleen Totemoff, iEXIST LLC · $49 · shieldpst.org
|
Online | Webinar |
| August27, 2026 |
Restraint Chairs & Use-of-Force Devices in Custody
$49 · shieldpst.org
|
Online | Webinar |
| October2026 |
ADA in the Jails: The Fragile Inmate
$795 · shieldpst.org
|
TBD | Symposium |
| Early Dec2026 |
AI Use in Administrative Investigations
$795 · shieldpst.org
|
Henderson, NV | Symposium |
Webinars: $49 per attendee · Symposiums: $695 per attendee · Register at shieldpst.org
