Public prosecution is the system by which government attorneys bring criminal cases on behalf of the public rather than leaving victims to pursue justice themselves. The attorney who does this work represents the community, not any single person harmed by the crime, and carries a duty the Supreme Court described in Berger v. United States as that of a “servant of the law” whose interest “in a criminal prosecution is not that it shall win a case, but that justice shall be done.”1Justia Law. Berger v. United States, 295 U.S. 78 (1935) That principle shapes everything that follows: who gets charged, what evidence must be shared, how cases end, and what happens when a prosecutor crosses a line.
What a Public Prosecutor Actually Does
The job starts long before anyone walks into a courtroom. Prosecutors review police reports, interview witnesses, and decide whether the facts support criminal charges. If they move forward, they draft the formal charging document, manage pretrial proceedings, and present the government’s case to a judge or jury. After a conviction, they recommend a sentence based on the offense and the defendant’s background.
What makes the role different from other lawyering is the obligation to seek a just outcome instead of simply winning. The American Bar Association’s Model Rules require a prosecutor to disclose all evidence that tends to negate guilt or mitigate the offense, and to reveal mitigating information at sentencing.2American Bar Association. Model Rules of Professional Conduct Rule 3.8 – Special Responsibilities of a Prosecutor A prosecutor who hides helpful evidence doesn’t just break a professional rule. They violate the Constitution.
Where Prosecutors Get Their Authority
Prosecutorial power flows from constitutional provisions and statutes, and it is divided by geography and subject matter. At the federal level, 28 U.S.C. § 547 directs each United States Attorney to “prosecute for all offenses against the United States” within that district.3Office of the Law Revision Counsel. 28 USC 547 – Duties State constitutions and statutes grant parallel authority to local district attorneys or state attorneys general, usually organized by county or judicial district.
Prosecutors sit in the executive branch. They answer to elected officials or directly to voters, not to the courts. That placement creates a deliberate tension: prosecutors enforce laws written by legislatures, but they exercise independent judgment about which cases to bring. Courts generally cannot force a prosecutor to file charges, and they cannot override charging decisions unless constitutional rights are at stake. Jurisdiction is also strictly bounded. A county prosecutor has no authority over crimes committed in a neighboring county, and a federal prosecutor lacks jurisdiction over offenses that fall solely under state law.
How Charges Get Filed
Every criminal case begins with a formal charging document, and the type depends on how serious the offense is. Under Federal Rule of Criminal Procedure 7, any offense punishable by death must be charged by indictment. Offenses carrying more than a year of imprisonment must also be charged by indictment unless the defendant waives that right, in which case the prosecutor can file an information instead.4Office of the Law Revision Counsel. Federal Rules of Criminal Procedure Rule 7 – The Indictment and the Information Less serious offenses can go either way.
The difference matters. An indictment comes from a grand jury: a panel of citizens who review the prosecutor’s evidence in a closed proceeding and decide whether probable cause exists. The defendant has no right to appear or present a defense. In federal cases, at least 12 grand jurors must agree before an indictment, called a “true bill,” can issue.5Legal Information Institute. Rule 6 – The Grand Jury An information is filed by the prosecutor alone, with no grand jury involvement.6United States Department of Justice. Indictment and Informations Most states use grand juries for serious felonies, though some let prosecutors file a preliminary complaint and have a judge make the probable cause finding at a hearing instead.
When Prosecutors Decide to Charge (and When They Don’t)
Having the authority to file charges doesn’t mean every provable crime becomes a case. The threshold question is probable cause, meaning a reasonable belief, supported by evidence, that a crime occurred and the suspect committed it. But probable cause is a low bar, and clearing it is only the beginning.
The Department of Justice’s Principles of Federal Prosecution impose a more demanding filter. A federal prosecutor should bring charges only when the admissible evidence will likely be sufficient to obtain and sustain a conviction, and even then should decline the case if any one of three things is true: there is no substantial federal interest, a state or local office is better positioned and willing to prosecute, or a civil, regulatory, or administrative remedy would serve justice as effectively as a criminal conviction.7U.S. Department of Justice. Principles of Federal Prosecution
In weighing a substantial federal interest, prosecutors consider the seriousness of the offense, its deterrent effect, the suspect’s criminal history, willingness to cooperate, and the interests of victims. The prior record of the accused carries real weight. Repeat offenders generally face more aggressive charging, while a first-time offender involved in a nonviolent act may be offered a diversion program or a plea to a lesser charge. Witness problems matter too: if the only eyewitness has serious reliability issues, the case may not survive cross-examination.
Some factors are off-limits. A prosecutor cannot base a charging decision on the suspect’s race, religion, gender, ethnicity, national origin, sexual orientation, or political beliefs. Personal feelings about the suspect or worries about how the case might affect the prosecutor’s career are also impermissible.
What Must Be Turned Over to the Defense
Two Supreme Court decisions define what prosecutors owe the defense in discovery. In Brady v. Maryland (1963), the Court held that suppressing evidence favorable to the accused violates due process “where the evidence is material either to guilt or to punishment, irrespective of the good faith or bad faith of the prosecution.”8Library of Congress. Brady v. Maryland, 373 U.S. 83 (1963) Any document, recording, or witness statement that could help the defendant must be handed over. Ignorance is not a defense; the duty applies even when the trial prosecutor personally didn’t know the evidence sat somewhere else in the government’s files.
Nine years later, Giglio v. United States extended that principle to witness credibility. When the government’s case leans heavily on a particular witness, the jury is entitled to know anything that could affect that person’s truthfulness, including deals for leniency, prior dishonesty, bias, or a financial stake in the outcome.9Justia Law. Giglio v. United States, 405 U.S. 150 (1972) The same obligation covers credibility problems with law enforcement witnesses, such as pending misconduct investigations or findings that an officer filed a false report. When a Brady or Giglio violation surfaces after trial, it often means a reversed conviction and a new trial.
Plea Deals and Diversion
Most federal criminal cases never see a jury. They end in plea agreements, with the defendant pleading guilty in exchange for reduced charges, a sentencing recommendation, or both. Federal Rule of Criminal Procedure 11 governs the process and builds in protections.10Legal Information Institute. Rule 11 – Pleas Before accepting any guilty plea, the judge must personally address the defendant and confirm they understand the rights they are giving up, including the right to a jury trial, to confront witnesses, and to remain silent. The judge must also confirm the plea is voluntary and that the facts support it.
Judges are not rubber stamps. A judge can reject a plea agreement outright, and if the deal includes a specific sentencing recommendation, the court must warn the defendant it is not bound to follow it. When a judge rejects a deal, the defendant can withdraw the guilty plea.
Some defendants bypass prosecution entirely through pretrial diversion. The Department of Justice lets U.S. Attorneys divert individuals against whom a prosecutable case exists, with a preference for young offenders, veterans, and people struggling with substance abuse or mental health challenges. Diversion is unavailable for offenses involving child exploitation, serious bodily injury or death, firearms, terrorism, or public corruption.11U.S. Department of Justice. Justice Manual 9-22.000 – Pretrial Diversion Program Prosecutors must also consult with victims before diverting any case.
The Clocks Running Against the Government
Two separate time limits constrain prosecutors. The first is the statute of limitations, which runs from when the crime occurred. For most federal offenses not punishable by death, the limit is five years: the indictment must be found or the information filed within five years of the offense.12Office of the Law Revision Counsel. 18 USC 3282 – Offenses Not Capital Some categories of crime carry longer windows, and offenses like murder typically have no statute of limitations at all.
The second clock is the Speedy Trial Act, which runs from arrest or charging. Once a person is arrested or served with a summons, the government has 30 days to file an indictment or information. After the charging document is filed, trial must begin within 70 days.13Office of the Law Revision Counsel. 18 USC 3161 – Time Limits and Exclusions Various pretrial events can pause the clock, including defense motions, competency evaluations, and interlocutory appeals. Miss the deadline without a valid exclusion and the charges can be dismissed.
Victims’ Rights During a Prosecution
Federal prosecutors carry statutory duties toward the people harmed by the crimes they prosecute. Under 18 U.S.C. § 3771, crime victims have the right to be reasonably protected from the accused, to receive timely notice of court proceedings, to attend those proceedings, and to be heard at hearings involving release, plea agreements, or sentencing.14Office of the Law Revision Counsel. 18 USC 3771 – Crime Victims Rights Victims can confer with the prosecutor on the case and must be informed of any plea bargain or deferred prosecution agreement before it is finalized.
The burden of compliance falls on the government. Federal officers involved in detecting, investigating, or prosecuting crime must make their “best efforts” to notify victims of these rights and ensure they are respected. The prosecutor must also advise victims they can consult their own attorney about exercising those rights. Most states have adopted similar victim-rights statutes, and some have written them into their state constitutions.
Limits on Suing a Prosecutor
Prosecutors have broad protection from personal lawsuits over their work. In Imbler v. Pachtman (1976), the Supreme Court held that a prosecutor acting “within the scope of his duties in initiating and pursuing a criminal prosecution and in presenting the State’s case” is absolutely immune from civil damages, even where the defendant’s constitutional rights were violated.15Justia Law. Imbler v. Pachtman, 424 U.S. 409 (1976) The rationale is practical. If prosecutors faced personal financial exposure for every charging decision, the threat of lawsuits would chill their willingness to bring difficult cases.
Absolute immunity has limits. It covers advocacy functions like presenting evidence, arguing in court, and making charging decisions. When a prosecutor steps outside that role and acts more like a detective or administrator, say by fabricating evidence during an investigation, the shield drops to qualified immunity or disappears. A malicious prosecution claim can succeed when a prosecutor knowingly files charges without probable cause and acts out of personal animosity rather than the interests of justice, though proving that combination is deliberately hard.
The usual accountability mechanisms are professional discipline and appellate review rather than lawsuits. State bar associations can suspend or disbar prosecutors who suppress evidence, mislead courts, or commit other ethical violations. Appellate courts can reverse convictions tainted by prosecutorial misconduct, and in serious cases judges can refer the misconduct to disciplinary authorities. These checks are imperfect, and critics argue that serious misconduct is rarely punished, but they are the main constraints on prosecutorial power outside the ballot box.
One related power sits beside prosecution rather than inside it: civil asset forfeiture lets the government seize property connected to criminal activity, often without filing criminal charges against the owner, under a lower burden of proof than a criminal conviction requires.16Office of the Law Revision Counsel. 18 USC 983 – General Rules for Civil Forfeiture Proceedings It is a civil proceeding against the property itself, not part of the criminal prosecution process described above.