Recent developments in federal case law are signaling a significant shift in how judicial bodies evaluate the deployment of less-lethal projectiles. For years, the law enforcement community relied on the classification of kinetic impact munitions (KIMs) as 'intermediate' force, often used as a primary tool for crowd dispersal. However, a series of rulings in early 2026 from the Fourth and Ninth Circuits has clarified that the deployment of these tools—specifically 40mm foam rounds and bean bag projectiles—against individuals who do not pose an immediate physical threat may no longer meet the 'objective reasonableness' standard under the Fourth Amendment.
Key Details
The core of the recent judicial pivot rests on the distinction between active resistance and passive non-compliance in high-stress environments. In several recent cases arising from 2024 and 2025 demonstrations, appellate courts have ruled that the 'seriousness' of the force must be weighed more heavily against the specific threat posed by the individual target, rather than the general volatility of a crowd. Evidence from medical experts presented in these cases suggests that the kinetic energy transfer from modern less-lethal systems can cause permanent injury, leading courts to view their use as 'significant force' that requires a high-level justification. This legal trend is forcing a transition from the 'area denial' mindset to a more surgical, threat-based application of less-lethal force.
Broader Context
Historically, the force continuum allowed for the use of less-lethal projectiles to prevent the breaching of police lines or to enforce dispersal orders. However, the legal landscape is catching up to the technological advancements in these systems. Modern launchers provide greater accuracy and velocity, which, while beneficial for officer safety, has increased the potential for injury if used outside of strict parameters. Nationally, there is a growing consensus among legal analysts that the era of 'indiscriminate' use of KIMs is ending. This follows a broader trend of civil litigation where municipalities are increasingly held liable for injuries sustained by non-aggressive bystanders during mass gatherings.
Implications for Law Enforcement
For command staff, these rulings necessitate an immediate review of Use of Force (UOF) policies. Agencies must move away from policies that permit 'skipping' or 'bouncing' rounds into a crowd to encourage movement. Instead, policy language should emphasize that kinetic impact munitions are to be used only against individuals who are engaging in violent behavior or who pose a clear, articulable threat to officers or the public. Furthermore, body-worn camera footage is becoming the primary evidence in these judicial reviews; if the footage does not clearly show an individualized threat prior to deployment, the officer and the agency face heightened legal exposure.
Conclusion
The strategic takeaway for law enforcement leadership is that less-lethal deployment is no longer a protected 'middle ground' of force. As the judiciary continues to refine the definition of reasonableness, agencies must ensure their field supervisors are trained to recognize the exact moment when the legal threshold for kinetic intervention is met. Moving forward, the emphasis must remain on precision and accountability to maintain both public trust and legal defensibility.
