Internal affairs is the division inside a law enforcement agency that investigates misconduct by its own officers. When an officer is accused of using excessive force, lying on a report, stealing, discriminating, or breaking department policy, the internal affairs unit, often shortened to IA, is the group that looks into what happened and recommends whether discipline is warranted. The unit exists so that complaints against officers are documented, examined, and resolved rather than ignored, and so the agency can show the public that its people are subject to rules.
IA sits inside the department it polices. That structural fact drives much of the debate around it, and it also explains why civilian oversight bodies and federal remedies have grown up alongside the internal process.
What Internal Affairs Investigates
The range of conduct IA handles is wide. On one end are small procedural slips; on the other, serious crimes. The most common categories include:
- Excessive force, including unjustified use of weapons, tasers, or physical restraint.
- Dishonesty, such as lying on police reports, falsifying evidence, or giving false testimony.
- Corruption and theft, including stealing money, drugs, or property on duty, or accepting bribes.
- Discrimination and harassment based on race, gender, religion, or other protected characteristics, including sexual harassment of coworkers or civilians.
- Procedural violations like illegal searches, improper arrests, or mishandled evidence.
- Neglect of duty, including failing to respond to calls, ignoring crimes in progress, or sleeping on duty.
Some complaints involve conduct that is also a crime, such as sexual assault or witness tampering. When that happens, the matter usually splits into two parallel investigations with different rules, which is explained below.
How an Internal Affairs Investigation Works
A complaint can reach IA from a civilian, another officer, a supervisor, or a referral from outside the department. Most agencies accept complaints in person, by mail, online, or by phone, and federal guidance encourages agencies to accept them from as many sources as possible, including anonymous ones, though some states and some departments restrict anonymous filings.1U.S. Department of Justice COPS Office. Standards and Guidelines for Internal Affairs – Recommendations from a Community of Practice
Once a complaint lands, IA does an initial review. Complaints that fall outside the unit’s jurisdiction, or that lack enough information to go anywhere, may be screened out. The rest get assigned to an investigator.
From there, the work looks a lot like any other investigation. The investigator pulls body-worn camera footage, in-car video, radio transmissions, police reports, medical records, and any physical evidence tied to the incident. They interview the complainant, the accused officer, and witnesses. In serious cases they may obtain phone records, nearby surveillance footage, or forensic evidence.
Timelines vary. A straightforward case can close in about 30 days; a complex one involving multiple officers or possible crimes can run 180 days or longer. When it’s over, the complainant generally receives a formal letter about the outcome, though how much detail that letter contains depends on the jurisdiction.1U.S. Department of Justice COPS Office. Standards and Guidelines for Internal Affairs – Recommendations from a Community of Practice
Deadlines to file an IA complaint vary too. Some jurisdictions give you months; others give you years. If you’re considering filing, acting quickly preserves witness memories and keeps your options open.
Administrative and Criminal Investigations Run on Different Tracks
When alleged misconduct could also be a crime, IA’s inquiry usually splits in two. One track is administrative, aimed at discipline inside the department. The other is criminal, aimed at prosecution. The rules governing each are fundamentally different, and keeping them separate is not optional.
In a criminal investigation, the officer has the same constitutional rights as anyone else. If taken into custody they receive Miranda warnings, they can refuse to answer, and searches must follow normal criminal procedure. Evidence collected here can be used later in the administrative case.
The administrative side runs differently. The officer generally does not have a right to remain silent about job-related questions; refusing to answer is insubordination that can lead to firing. The protection, and it is a significant one, is that statements the officer is compelled to give during the administrative investigation cannot be used against them in a criminal prosecution. That rule comes from the Supreme Court’s 1967 decision in Garrity v. New Jersey, which held that forcing public employees to choose between their jobs and their right against self-incrimination is unconstitutional coercion.2Justia Law. Garrity v. New Jersey, 385 U.S. 493 (1967)
If investigators mix the two tracks, compelled administrative statements can contaminate the criminal case and make prosecution impossible. That’s why agencies usually give a formal “Garrity warning” before administrative questioning, telling the officer they must answer but that their answers are shielded from criminal use.
The Four Possible Outcomes
Every allegation in a complaint receives one of four standard dispositions when the investigation closes:1U.S. Department of Justice COPS Office. Standards and Guidelines for Internal Affairs – Recommendations from a Community of Practice
- Sustained: the evidence shows the officer committed the misconduct.
- Not sustained: there isn’t enough evidence to prove or disprove the allegation.
- Unfounded: the investigation determined the alleged conduct did not happen.
- Exonerated: the conduct happened, but it was lawful and within policy.
“Not sustained” is the one that frustrates complainants most. It doesn’t mean the agency sided with the officer. It often means the incident came down to one person’s account against another’s, without video, witnesses, or physical evidence to tip the balance.
What Happens to an Officer After a Sustained Finding
When an allegation is sustained, the discipline depends on how serious the misconduct was, what the officer’s record looks like, and the agency’s own policies. Possible outcomes, from least to most severe, include verbal counseling or retraining for minor slips, a written reprimand placed in the personnel file, suspension without pay ranging from a few days to several weeks, demotion or removal from a specialized assignment, and termination for the most serious or repeated violations.
Criminal charges can also come out of an IA investigation, but they’re handled separately through the criminal justice system. An officer can be fired administratively and prosecuted criminally for the same conduct.
The Brady List Consequence
A sustained finding can carry a less visible cost. Under Brady v. Maryland, prosecutors must disclose to defendants any evidence that could undermine the credibility of a prosecution witness. An officer with a sustained finding for dishonesty, excessive force, or similar integrity-related conduct becomes someone whose history prosecutors have to hand over whenever that officer testifies.3U.S. Department of Justice. Justice Manual 9-5000 – Issues Related to Discovery, Trials, and Other Proceedings
Officers in that position may end up on what’s informally called a “Brady list.” Some prosecutors decide a listed officer’s credibility is too compromised to put on the stand at all. For an officer whose job depends on testifying, that can effectively end a career even without a formal termination.
Rights Officers Have During an IA Investigation
The process is not one-sided. Officers under investigation have protections that go well beyond what a typical private-sector employee would have.
The federal baseline is Garrity: compelled statements in administrative questioning stay out of criminal court.2Justia Law. Garrity v. New Jersey, 385 U.S. 493 (1967) Officers also generally have the right to have an attorney or union representative present during administrative interviews.
On top of that, roughly 19 states have enacted some version of a Law Enforcement Officers’ Bill of Rights, which layers in additional procedural protections. The specifics vary, but common provisions include a waiting period of 48 to 72 hours before questioning so the officer can get a lawyer, caps on how long an interview session can run, advance written notice of the allegations, access in some states to the evidence against the officer before questioning, and the right to union representation throughout.
These rules are a persistent source of argument. Accountability advocates say they slow discipline and shield officers; police groups say they’re ordinary due process for employees whose careers can be destroyed by a single complaint. Either way, they help explain why IA cases sometimes move slowly and why outcomes don’t always track what the public expects.
Civilian Oversight as an Alternative Path
Because IA sits inside the department, many cities and counties have set up civilian oversight bodies to work alongside or above it. These generally take one of three forms. A review board is made up of civilians who look at completed IA investigations and can agree, disagree, or push for more work, but doesn’t investigate itself. An independent investigator model uses civilian investigators to run inquiries directly, rather than relying on the police department. An auditor or monitor model places a civilian in a continuous oversight role, reviewing intake, investigation quality, and outcomes, and sometimes auditing broader patterns like stops, arrests, and uses of force.
How much any of this matters depends on the powers the body actually has. A board that can only issue non-binding recommendations is a very different thing from an investigator with subpoena power. If your area has a civilian oversight agency, it’s worth checking whether it accepts complaints directly, because that can be an alternative route alongside IA.
If You’re Not Satisfied with the Outcome
An IA result you disagree with isn’t necessarily the end. A civilian oversight body, if your jurisdiction has one, may be able to take the complaint or formally disagree with IA’s finding and push for more investigation.
For misconduct that involves civil rights violations, the Department of Justice’s Civil Rights Division enforces federal laws against police misconduct motivated by discrimination, and those protections cover retaliation against people who file DOJ complaints or participate in investigations.4U.S. Department of Justice. Addressing Police Misconduct Laws Enforced by the Department of Justice
You can also sue. Under 42 U.S.C. § 1983, individuals can bring a federal civil rights lawsuit against any person who, acting under government authority, deprives them of their constitutional rights.5Office of the Law Revision Counsel. 42 U.S. Code 1983 – Civil Action for Deprivation of Rights A § 1983 case is civil, aimed at monetary damages, and does not depend on IA having sustained the complaint. Many successful civil rights suits against officers have proceeded no matter what IA concluded. The deadline is typically two to three years from the incident, set by the relevant state’s statute of limitations for personal injury claims, so talking to a civil rights attorney early keeps the most options open.