Make me Understand Why....

As an expert witness who has read thousands of police reports and supporting documents in criminal and civil cases dealing with law enforcement canine apprehensions and use of force, I’m able to see how plaintiff’s attorneys and experts view and opine on the actions of canine handlers during deployments

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Jeff Barrett

12 June 2026

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german shepherd and handler

As an expert witness who has read thousands of police reports and supporting documents in criminal and civil cases dealing with law enforcement canine apprehensions and use of force, I’m able to see how plaintiff’s attorneys and experts view and opine on the actions of canine handlers during deployments.

In this blog series I’ll share some of these ideas and opinions which lend themselves to supporting their assertions of the Fourth Amendment infringements on behalf of their clients from my personal experiences defending the actions of law enforcement canine handlers.

Many times, canine handlers will be questioned during depositions about the “time on bite” and be asked to explain why body camera video footage appears to show a complaint and surrendering suspect who’s still being held by a police canine. Does your police report make me understand WHY and does it comport with the videos?

It’s important to have the answers both in your written police report and be able to verbally articulate the facts that support not removing the police dog from the bite from a suspect who appears to be compliant in videos.

What you knew about the suspect, his crimes, his criminal history, his emotional history, his current emotional condition, and his current capacity or potential to escape, fight, resist, or otherwise place officers and others in imminent danger are things that you might consider important for the readers of your report to understand and to make sense of an incident that might not at first glance.

You cannot gloss over this concern nor paint it with the broad stroke of a “catch-all” phrase or idea. For example, we cannot simply write in each incident that “The dog was removed from the bite after he was handcuffed” OR “I left the canine on the bite for fear that he would injure us (officers) or escape into the neighborhood where he would be an imminent threat to citizens”. The details must support this idea and without them, your actions can be visually overwhelming and seemingly outside of the laws and your department’s General Orders.

Our society affords law enforcement officers the power to use force to make arrests, but it holds us accountable to being reasonable with uses of force and so it is expected of us to be educated, well informed and be able to articulate our actions so that we make them understand why.

Here’s a comparison example of how the circumstances and facts of an incident guide the courts in determining whether an officer is justified in their use of force with their police canines.

Here’s two different court cases with similarities but clear and distinguishable differences in the circumstances. In both cases, a police dog was used to bite a suspect, but the circumstances differ enough that they can help show the contrast between a justified use of force and one that wasn’t.

Research these two cases, Preister v. City of Riviera Beach and Crenshaw v. Lister. You’ll see from reading them that the totality of the circumstances helped support the time on the bite in the Crenshaw v. Lister case. Whereas the Preister v. City of Riviera Beach case fell short in proving the time on the bite was a proper use of force.

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chatrie v US

Legal Update

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GEO Warrants - Chatrie v. United States

This summarizes the United States Supreme Court's decision in Chatrie v. United States, a landmark Fourth Amendment case addressing law enforcement's use of geofence warrants to obtain historical cell-phone location data from technology companies.

Facts of the Case

On May 20, 2019, a man robbed a credit union in Midlothian, Virginia. Investigators interviewed witnesses and reviewed surveillance video. The footage showed the suspect carrying and apparently using a cellular telephone before the robbery, but investigators were unable to identify the suspect through traditional investigative methods.

Detectives obtained a geofence warrant directed to Google. The warrant required Google to search its Location History database and identify every device located within approximately 150 meters of the credit union during the relevant time period.

The warrant operated in three stages:

  1. Google produced anonymized location data for every qualifying device within the geofence.
  2. Investigators narrowed the list based on movement patterns, and Google provided additional anonymous location data.
  3. After investigators identified several devices of interest, Google disclosed subscriber information associated with those accounts.

The investigation ultimately identified Okello Chatrie, whose movements were consistent with those of the robber. Additional investigation linked Chatrie to the robbery, and he was prosecuted in federal court.

Chatrie filed a Motion to Suppress the location data obtained through the geofence warrant, asserting that the obtaining of his cell phone location data was serch under the Fourth Amendment and that the warrant obtained by law enforcement lacked probable cause.

The District Court found that the geofence warrant "plainly violates the Fourth Amendment" but denied the Motion to Suppress based on the good-faith exception to the exclusionary rule. The Fourth Circuit Court of Appeals affirmed the District Court's ruling on different reasoning, holding that no search occurred because Chatrie "did not have a reasonable expectation of privacy in two hours ' worth of location history data voluntarily exposed to Google". The Supreme Court granted review solely on the question of whether the police violated the Fourth Amendment in obtaining Chatrie's location data.

Supreme Court Holding

On June 29, 2026, the Supreme Court held that law enforcement conducts a Fourth Amendment search when it acquires historical cell-phone location information through a geofence warrant from Google or any other provider. The court concluded that individuals maintain a reasonable expectation of privacy in their historical location information even when the information is stored by a third-party service provider such as Google. The court rejected the government's argument that users automatically lose Fourth Amendment protections simply because their location information is voluntarily shared with a technology company. Importantly, the Court did not decide whether the warrant used in Chatrie ultimately satisfied the Fourth Amendment's probable cause and particularity requirements. Instead, it remanded the case for further proceedings to determine whether the specific geofence warrant in this case met constitutional standards.

Officer Considerations

Officers Should recognize that:

  • Accessing historical location data through a geofence warrant is now considered a Fourth Amendment search.
  • Even though Google changed Location History in July 2025 so that data stored is stored on individual devices, other companies (Apple, Lyft, Uber, Snapchat, etc...) use location data and this decision extends to location data generally.
  • Geofence warrants are subject to constitutional scrutiny including probable cause and particularity requirements
  • A Geofence Warrant should be broken down into three separate warrants establishing probable cause for each step of the search.
  • Investigators should expect closer judicial review of requests seeking location information involving multiple unknown individuals.
  • Applications should be narrowly tailored in geographic scope, time period, and investigative necessity.
  • Officers should consult prosecutors and legal advisors before seeking geofence warrants to ensure compliance with evolving constitutional standards.

Practical Impact

This decision does not prohibit geofence warrants. Instead, it requires courts to evaluate under traditional Fourth Amendment standards rather than treating the information as unprotected because it is held by a third party.

Investigators should anticipate increased judicial scrutiny and should ensure affidavits clearly articulate:

  • the factual basis established probable cause;
  • How the geographic area is related to the crime under investigation;
  • That the requested time period is narrowly tailored to the information sought; and
  • Why less intrusive methods, if available, would be insufficient to identify a suspect(s).

heat stroke

Medical and Safety

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K9 Heat Stroke - By the numbers

By the numbers, the total of ten law enforcement K-9 heatstroke deaths that occurred in 2025 fits right into the historical pattern — more than 2024, but less than 2023, and the same, on average, with the decade prior.

By the numbers, the total of ten law enforcement K-9 heatstroke deaths that occurred in 2025 fits right into the historical pattern — more than 2024, but less than 2023, and the same, on average, with the decade prior.

Still, there was a positive development: K-9 heatstroke deaths were more widely and forthrightly acknowledged by law enforcement agencies. This trend of quickly informing the public, and taking more explicit responsibility for these tragedies — most of them avoidable — is a step forward in actively addressing the problem.

2025 K-9 Heatstroke Deaths

As reported in public media

Kai4/23/25Bristol TN PDTraining

Scout5/27/25Suffolk VA PDTracking

Baxter5/28/25Maine DPSIn-vehicle

Henk6/21/25Helen GA PDTraining

Ender6/25/25Dorchester Cty. MD SheriffIn-vehicle

Sam7/8/25Lexington Cty. SC SheriffTraining

Georgia7/13/25Dade Cty. GA SheriffIn-vehicle

Karma8/8/25Isanti Cty. MN SheriffTracking

Archer9/4/25Hawai'i Cty. HI PDIn-vehicle

Cooper9/5/25Muskingum Cty. OH SheriffIn-vehicle

This year, two K-9s died while deployed in tracking, a primary duty of K-9 teams, with recognized risk. The other eight deaths were unrelated to law enforcement action. Three occurred during or soon after organized training events. Five K-9s perished while confined in a vehicle.

Whether deployed at their most instinctual tasks, exercising in-step with their beloved Handler, or secured per protocol inside their specially-equipped duty vehicle — that is to say, practically anywhere in the course of their typical daily activities — healthy K-9's are at risk of suddenly incurring heatstroke and dying. Just as ubiquitously true is that, no one is more shocked and heartbroken by a K-9's heatstroke death than their Handler.

A Hopeful Trend

By the numbers, 2025 K-9 heatstroke deaths and their causes persisted in line with the long-term trend. But important cultural progress was demonstrated by departments' public acknowledgement of most of this year's tragedies. In general the reports were met by immediate social media response that was broadly angry, but also to some extent, sympathetic. Most reports triggered a cascade of external and internal challenges.

Each death was investigated internally, and in some cases, externally. Several Handlers were charged and/or fired outright. Others were disciplined. Probably none will be assigned to police K-9 duty ever again.

The departments took their lumps — public outrage, internal penitence, the loss of the canine's unique policing skills, a disgraced officer, disrepute among K-9 unit funding and support institutions, etc.

Some departments undertook internal review of the policy and protocol failures that may have contributed to the tragedy. One department made their internal findings and corrections public, by declaring policy changes where gaps had been found deficient.

Accepting tough medicine is an important cultural change. Not long ago, most unnecessary K-9 deaths were kept quiet, and responsibility obscured. This tendency persists: one department made a concerted effort to obfuscate a K-9's in-vehicle death. While the officers involved eluded statutory consequence, the department finds itself months later still under a spotlight and still in civil jeopardy, while their oversight governance structure is embarrassed by their inability to implement meaningful accountability.

Acceptance is the First Step

Ultimately, 2025 was another bad year for K-9 heatstroke. But wider acknowledgement of unnecessary K-9 deaths by departments, even in the face of severe consequences, is becoming a strong impetus to finally start acting effectively against heatstroke risk in 2026.

K-9Cooler's mission to AVOID, ALLEVIATE, and PREVENT heat injury to working dogs has inspired development of active-principle products that are effective against heat injury. Visit our store to learn how the K-9 Heatstroke Emergency Field Kit can multiply your K-9's chance of surviving a serious heat injury episode, and save your department from the disgrace of an unnecessary K-9 death.

*Joshua Davidson is the Founder of K-9Cooler, which makes products to AVOID, ALLEVIATE, and PREVENT heat injury to working dogs, including the K-9 Heatstroke Emergency Field Kit.*

ted daus

Legal Update

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USA v. Evans (3d Cir. 2026) May 19, 2026

Scope of a Search When Executing a Search Warrant. In United States v. Evans, officers obtained a warrant to search a New Jersey hotel room for evidence connecting its occupant to illegal firearms.

Scope of a Search When Executing a Search Warrant

USA v. Evans, (3d Cir. 2026) May 19th 2026

In United States v. Evans, officers obtained a warrant to search a New Jersey hotel room for evidence connecting its occupant to illegal firearms. During the search, a detective noticed a piece of broken ceiling tile sitting on the bed. Standing on the bed, he pressed on the damaged tile, causing a loaded pistol magazine to fall from the ceiling. Searching the area above the drop ceiling, officers recovered duffel bags containing drugs, cash, and other incriminating evidence.

Evans argued the search exceeded the warrant’s scope. The 3rd Circuit disagreed, holding the ceiling space was a reasonable place to search for the items listed in the warrant. The damaged ceiling, the fallen magazine, and Evans’ opportunity to access the area all supported the detective’s decision to search the ceiling cavity.

A search warrant authorizes officers to look anywhere the listed evidence could reasonably be hidden. As the U.S. Supreme Court explained in United States v. Ross (456 U.S. 798, 824 (1982)), the scope of a lawful search is defined by “the object of the search and the places in which there is probable cause to believe that it may be found.”

The principle is straightforward. A warrant for drugs, firearms, ammunition, cash, or documents may justify searching drawers, backpacks, crawlspaces … and the space above a drop ceiling. A warrant for a stolen refrigerator likely does not.

That’s precisely why the search in Evans was upheld. Firearm accessories and identifying evidence could reasonably have been hidden above the ceiling tiles.

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