A police grappler is a vehicle-mounted device that lets an officer end a car chase by wrapping a heavy-duty net around a fleeing vehicle’s rear wheel and then braking the patrol car to drag it to a stop. It’s made by Stock Enterprises, LLC and, as of 2024, is in use at roughly 40 to 50 law enforcement agencies across the country. Compared to spike strips and the PIT maneuver, it’s still a newcomer, but adoption is growing.
What It Looks Like
Mounted on the front of a patrol car, the grappler is easy to miss. It’s disguised to look like a reinforced bumper guard. Two parts do the actual work: an extendable arm hidden behind the bumper, and a heavy-duty nylon net or strap attached to that arm. A tether line connects the whole assembly to the patrol vehicle, and that tether is what gives the officer control of the stop.
How a Deployment Works
Deployment is a close-range maneuver. The pursuing officer pulls up directly behind the fleeing car and lines the patrol car’s bumper up within inches of one of the target’s rear tires. From inside the cabin, the officer triggers the device. The arm swings the net underneath the target vehicle.
The net binds around the rear tire, axle, and suspension components so the wheel can’t spin. Because the net is tethered to the patrol car, the officer then applies their own brakes, and the drag of the patrol vehicle forces the fleeing car to slow down. The result looks more like a controlled emergency stop than a collision or a spinout. The driver doesn’t need to cooperate for it to work.
When Officers Are Authorized to Use It
Departments that carry the grappler don’t leave the decision up to the individual officer. Written policies typically require supervisor approval and limit the device to serious situations: pursuits tied to violent felonies like homicide, kidnapping, robbery, or aggravated assault with a weapon. Many policies also allow deployment against stolen vehicles, suspects with a documented history of fleeing, or as part of a preplanned felony arrest.
One of the device’s selling points is that it can stop a vehicle before a chase builds up speed. Ending a pursuit at 30 mph in a commercial district is far less dangerous than ending one at 70 mph on a highway.
When It Shouldn’t Be Used
Agency policies consistently rule out certain targets and conditions:
- Large or heavy vehicles like semi-trucks, moving trucks, and RVs. Their momentum is more than the patrol car can brake against.
- Vehicles with fewer than four wheels. Motorcycles and three-wheelers are excluded unless deadly force has already been authorized, because entangling one wheel on a two-wheeled vehicle almost guarantees a crash.
- Vehicles suspected of carrying hazardous materials.
- Speeds above roughly 75 mph, which most policies set as the upper limit.
- Pedestrian-heavy areas where a stopped vehicle could end up in a crowd.
Officers are also expected to size up road conditions, traffic density, and whether backup is close enough to help before activating the device.
How It Compares to Spike Strips and the PIT Maneuver
The grappler exists because the alternatives all carry serious drawbacks.
Spike Strips
Spike strips are the most common pursuit-ending tool in American policing. They puncture a vehicle’s tires with hollow spikes that break off inside the rubber and cause a slow deflation. The weakness is deployment: an officer has to stand near the roadway and drag or throw the strip into the path of a car that may be moving at highway speed. Officers have been killed doing it. With the grappler, the deploying officer never leaves the patrol car.
Spike strips are also unpredictable. A sudden blowout at high speed can send a suspect into oncoming traffic or into a complete loss of control. The grappler’s tether gives the officer some ability to steer the deceleration, though closing to within inches of the fleeing car brings its own risks.
The PIT Maneuver
The Precision Immobilization Technique uses the patrol car to nudge the rear quarter panel of a fleeing vehicle and spin it sideways. It’s effective and costs nothing beyond training, which is why most agencies still use it. But PIT maneuvers carry a real rollover risk, especially at higher speeds, and have been linked to dozens of deaths since the mid-2010s. The grappler decelerates in a straight line rather than forcing a spin, which lowers rollover risk. PIT, on the other hand, works at a wider range of speeds and against any vehicle type.
Known Limitations
The grappler is not a universal solution. The most discussed weakness is front-wheel-drive vehicles. Because the device targets the rear wheels, it doesn’t disable the drivetrain on a front-wheel-drive car. The rear wheels lock up, but the front wheels can still pull the vehicle forward. Agencies that have run into this problem require additional patrol units on scene so they can box the suspect in once the grappler slows the car down.
The close-range positioning is also risky. If the suspect brakes hard while the officer is closing the gap, a rear-end collision at pursuit speed could be severe. That’s part of why training requirements are strict and supervisor approval is typically required.
The Legal Picture
Deploying a grappler against an occupied vehicle is a seizure under the Fourth Amendment. The Supreme Court held in Torres v. Madrid that any application of physical force to a person with intent to restrain is a seizure, even if the person isn’t successfully subdued.1Justia U.S. Supreme Court Center. Torres v. Madrid, 592 U.S. ___ (2021) So the officer needs a legal basis to deploy, typically probable cause for a specific offense.
Whether deployment amounts to excessive force is evaluated under the “objective reasonableness” standard from Graham v. Connor: how serious was the underlying crime, did the suspect pose an immediate danger, and was the suspect actively resisting or fleeing.2Justia U.S. Supreme Court Center. Graham v. Connor, 490 U.S. 386 (1989) The grappler generally fares well under this test because it’s built to minimize injury compared to ramming, shooting, or PIT, but using it against a low-level offender at moderate speed could still be challenged as disproportionate.
Who Pays If a Bystander Is Hurt
If a deployment damages a bystander’s vehicle or injures a third party, the fleeing suspect usually bears primary liability because their decision to flee set the chain of events in motion. A bystander can pursue the suspect’s insurance or sue the suspect directly.
Claims against the police department are harder. Government agencies generally have some form of sovereign immunity. In many states that immunity is waived when a government vehicle is involved in a collision and the department carries liability insurance, which can open the door to a claim if the department authorized a pursuit recklessly or deployed the grappler in a way that violated its own policy. These cases tend to be long and difficult to win.
For the suspect whose vehicle is stopped, damage to the rear wheel, axle, and suspension is treated as a foreseeable consequence of fleeing, and suspects rarely recover anything for it.
Adoption and Cost
Roughly 40 to 50 agencies had adopted the grappler as of 2024, with deployments reported in states including Texas, Nevada, and Illinois. A single unit with training runs about $8,000 to $10,000. That’s significant for a small department but modest next to the liability exposure from a pursuit gone wrong.
Adoption is still limited for reasons beyond price. The device requires dedicated training, works only on certain vehicle types, and demands close-range positioning that many officers find nerve-wracking at pursuit speeds. Departments that buy it tend to equip a small number of supervisor vehicles rather than the whole fleet, treating the grappler as one option alongside spike strips and PIT rather than a replacement for either.