After a police shooting, two investigations begin at once under the standard officer-involved shooting investigation protocol: a criminal inquiry into whether the use of force was lawful, and an administrative review into whether it followed department policy. They run on different legal standards, ask different questions, and can reach different conclusions about the same event. That is why a shooting can be ruled legally justified and still cost an officer their job, or clear policy review and still produce a civil lawsuit years later.
Here is how each track works, who runs it, and what the law requires at every stage.
The First Minutes on Scene
The immediate priority is medical aid and scene control. Agency policy generally directs officers to request emergency medical services for anyone injured, including the person shot, as soon as the scene is safe. Federal courts have not established a universal constitutional duty for officers to personally render aid before paramedics arrive; the scope of any obligation depends on jurisdiction and circumstances.
A supervisor takes over, a perimeter goes up, and everyone who enters is logged with name, agency, reason, and times. Officers who fired are separated from each other and from witnesses, each paired with a companion officer whose only role is to make sure they do not discuss the incident before investigators are ready. The reason is practical: people who talk through a traumatic event tend to adopt each other’s details without realizing it, which contaminates later statements.
Before any formal interview, an involved officer typically gives a brief public safety statement. It is not a narrative. It covers only immediate threats: the direction of fire, whether suspects are still outstanding, and where injured people are. Everything else waits.
Who Runs the Criminal Investigation
The biggest structural change in these investigations over the past two decades is that departments usually no longer investigate their own shootings. Most modern protocols assign the criminal investigation to an outside agency through a pre-existing Memorandum of Understanding that identifies, in advance, which external body takes the lead.1Bureau of Justice Assistance. Considerations and Recommendations Regarding State and Local Officer-Involved Use of Force Investigations That might be a state bureau of investigation, a neighboring jurisdiction’s homicide unit, or a multi-agency task force.
Once the outside team arrives, the on-scene supervisor briefs them and the lead agency assumes full control of the criminal side. The involved department still runs its internal review but no longer directs the criminal case. The separation exists because the local prosecutor and the involved department work together daily, and that relationship creates at least the appearance of a conflict. Some jurisdictions go further and appoint a special prosecutor, replacing the local district attorney for this one case.
Independent civilian oversight bodies add another layer in many communities. Their authority varies widely. Some only review internal affairs findings after the fact; others conduct their own investigations and are required to review every firearm discharge whether or not anyone complained.2National Institute of Justice. Citizen Review of Police: Approaches and Implementation Roughly 40% have subpoena power, though most rarely use it, and state confidentiality laws often limit what they can access or publish. Their reach is usually advisory rather than disciplinary.
What Investigators Collect
Crime scene technicians work to reconstruct the shooting through physical evidence rather than through anyone’s account. Shell casings, bullet trajectories, and the officer’s firearm and remaining ammunition all go into evidence. Body-worn and dashboard camera footage is downloaded and secured as soon as cameras are recovered. Video is the most complete record in most cases, but it has limits: a fixed field of view, distorted audio, and a perspective that rarely matches what the officer actually saw. Investigators supplement it with 3D laser scanning or high-resolution photography to map sightlines and distances precisely.
Gunshot residue testing is routine, and routinely misunderstood. The FBI has explained that a positive GSR result is only consistent with firing a weapon, being near one when it was fired, or touching a contaminated surface; a negative result does not prove someone did not fire, because residue can be lost through ordinary hand movement within minutes.3FBI Law Enforcement Bulletin. The Current Status of GSR Examinations It is one data point, not proof.
Some agencies require toxicology testing of every officer who fires; others test only on suspicion of impairment. Vehicle GPS and patrol-car telematics pin down timing and location. The goal across every step is a factual record that does not depend on memory.
The Legal Standard Everything Is Measured Against
All of that evidence feeds into one question: was the force objectively reasonable under the circumstances? The Supreme Court set this framework in Graham v. Connor (1989), holding that excessive-force claims against law enforcement during an arrest or seizure are analyzed under the Fourth Amendment’s reasonableness standard.4Justia. Graham v. Connor, 490 U.S. 386 (1989) The Court identified three factors:
- The severity of the crime at issue.
- Whether the person posed an immediate threat to the officer or others.
- Whether the person was actively resisting or trying to flee.
Courts apply these factors from the perspective of a reasonable officer on scene at the moment force was used, not with hindsight. The officer’s subjective intent does not matter under this test. What matters is whether the actions were objectively reasonable given what the officer knew and faced.
For deadly force specifically, Tennessee v. Garner (1985) set a higher bar. Officers may not use deadly force to stop a fleeing suspect unless they have probable cause to believe the person poses a significant threat of death or serious physical injury to the officer or others. An unarmed, non-dangerous suspect who is simply running away cannot be shot. These two decisions form the constitutional floor every shooting is measured against.
The Officer’s Statement and Garrity
Getting a formal statement from the officer who fired is one of the most legally delicate parts of the process. Many agencies build in a waiting period before the criminal interview, often around 48 to 72 hours, though the practice is far from universal. Police Executive Research Forum survey data found about a third of agencies had preset waiting periods, and PERF itself recommended against rigid mandatory delays in favor of flexible approaches. During any waiting period the officer is typically on administrative leave with their duty weapon collected for examination.
A doctrine called Garrity protection shapes how officer interviews work, and misunderstanding it accounts for much of the public confusion about these cases. In Garrity v. New Jersey (1967), the Supreme Court held that statements obtained from public employees under threat of termination are involuntary and cannot be used in a criminal prosecution.5Justia. Garrity v. New Jersey, 385 U.S. 493 (1967)
In practice this means a department can order an officer to answer questions during internal affairs, and the officer must answer or face discipline up to termination. But nothing said in that compelled administrative interview, and no evidence derived from it, can be introduced in a criminal case. A firewall sits between the two tracks. Criminal investigators cannot sit in on the administrative interview, cannot read its transcript, and cannot use it to develop leads. If the wall is breached, the criminal case can collapse.6COPS Office. Standards and Guidelines for Internal Affairs: Recommendations from a Community of Practice
The officer has the right to legal representation in any formal interview, criminal or administrative. In the criminal interview, investigators focus on the officer’s perception of the threat, the information available at the moment force was used, and the sequence of decisions that led to the shooting. The recorded interview becomes part of the final file that goes to the prosecutor.
The Parallel Administrative Review
While the criminal investigation asks whether the law was broken, the administrative one asks a broader set of questions. Did the officer follow policy? Were there tactical failures? Does the shooting reveal a training gap? The standard of proof is lower: preponderance of the evidence rather than proof beyond a reasonable doubt. An officer can be cleared criminally and still face discipline for policy violations.6COPS Office. Standards and Guidelines for Internal Affairs: Recommendations from a Community of Practice
Agencies commonly pause the administrative investigation while the criminal inquiry is active, often at the prosecutor’s request, to keep Garrity-protected material from contaminating the criminal case. That delay has costs: memories fade, the officer stays under a cloud, and the department cannot implement corrective action. Some agencies now run both investigations simultaneously with strict information barriers between the two teams.
A declination by the prosecutor does not end the administrative review. The two tracks examine different questions, so an officer who committed no crime may still have violated use-of-force policy, failed to activate a body camera, or made tactical decisions that unnecessarily escalated the encounter.6COPS Office. Standards and Guidelines for Internal Affairs: Recommendations from a Community of Practice
The Charging Decision
Once the lead investigative agency finishes its file, the case goes to a prosecutor, typically a district attorney or attorney general. The prosecutor measures the evidence against the Graham v. Connor factors and any applicable state use-of-force statutes. In some jurisdictions the prosecutor presents findings to a grand jury, which decides whether to indict. In others, the prosecutor makes the charging decision alone.
Where there is a close working relationship between the local district attorney and the involved department, a special prosecutor may be appointed to insulate the decision from the appearance of a conflict. Prosecutors depend on police as witnesses in other cases, and that interdependence is the reason outside review exists at this stage as well as during the investigation itself.
If the prosecutor or grand jury concludes the shooting was legally justified, the office issues a declination report explaining the reasoning. These reports are frequently made public. If the review finds evidence of criminal conduct, charges can range from assault to manslaughter to murder depending on the facts. From the end of the criminal investigation to the charging decision, the review can take months, and some jurisdictions impose statutory deadlines to prevent indefinite delays.
What Happens After a Declination
Clearing the criminal track does not end the officer’s or the department’s legal exposure. The family of a person killed or injured can sue under 42 U.S.C. § 1983, which allows anyone to sue a government official who deprived them of constitutional rights while acting in an official capacity.7Office of the Law Revision Counsel. 42 U.S. Code 1983 – Civil Action for Deprivation of Rights In a shooting case the plaintiff typically argues the force was unreasonable under the Fourth Amendment, applying the same Graham factors but under a lower burden of proof.
Officers sued civilly usually raise qualified immunity. Under that doctrine an officer cannot be held personally liable unless the plaintiff shows the officer violated a “clearly established” constitutional right, meaning prior case law with facts close enough that a reasonable officer would have known the conduct was unlawful. Courts have dismissed cases where the specific scenario had no sufficiently close precedent, even where the force seemed excessive. Qualified immunity does not shield the agency or municipality, which can face separate § 1983 liability for an unconstitutional policy or a failure to train.
When a single shooting suggests a broader problem, the U.S. Department of Justice can open a pattern-or-practice investigation under 34 U.S.C. § 12601, which makes it unlawful for any government authority to engage in a pattern or practice of law enforcement conduct that deprives people of constitutional rights.8Office of the Law Revision Counsel. 34 U.S. Code 12601 – Cause of Action A single incident does not trigger this authority; the DOJ must find unlawful conduct that is repeated or sustained over time.9U.S. Department of Justice. FAQ About Pattern or Practice Investigations
These investigations are civil. The DOJ reviews policies, accountability systems, complaint handling, and discipline across the whole agency. If systemic violations are found, the DOJ publishes a report and can sue to obtain a court-enforced reform agreement, commonly called a consent decree. Evidence that individual officers committed federal crimes is referred to federal prosecutors separately.9U.S. Department of Justice. FAQ About Pattern or Practice Investigations
What the Public Gets to See
Pressure for timely information has pushed many jurisdictions to adopt formal disclosure timelines, particularly for body-worn camera footage. Mandated release windows vary; some jurisdictions require release within 30 days of a critical incident, while others leave timing to agency discretion. Where footage is withheld during an active investigation, agencies generally must articulate a specific reason, and the withholding period is often capped.
Grand jury proceedings are a different story. Federal rules and most state laws impose strict confidentiality on grand jury deliberations, with criminal penalties for unauthorized disclosure. When a grand jury declines to indict, the public usually learns only the decision, not the evidence or testimony behind it. Some jurisdictions release limited summaries or the prosecutor’s presentation after the fact, but full transcripts remain the exception. The gap between what the public wants to know after a shooting and what the legal system allows to be shared is where most of the lasting friction around these investigations lives.