In a criminal case, the prosecution represents the government: it decides whether charges will be filed, what those charges will be, how the evidence is gathered and disclosed, whether a plea deal is offered, how the case is tried, and what sentence to argue for after a conviction. The prosecution carries the burden of proving guilt beyond a reasonable doubt, and its ethical obligation is to seek justice rather than simply to win. What the prosecution does in a criminal case runs from the first review of a police report all the way through appeals, and most of a prosecutor’s influence is exercised long before anyone sees a courtroom.
Who the Prosecutor Is
State prosecutors go by different titles depending on the jurisdiction: district attorney, county attorney, state’s attorney, or commonwealth’s attorney. Most are elected and supervise a staff of assistant prosecutors who handle day-to-day cases. In the federal system, each judicial district has a United States Attorney appointed by the President, with Assistant U.S. Attorneys handling the caseload.
All of them work under ethical rules that separate prosecutors from other lawyers. American Bar Association Model Rule 3.8 forbids filing any charge the prosecutor knows lacks probable cause, requires reasonable efforts to make sure defendants know they have a right to counsel, and requires disclosure of all evidence that points toward innocence or lowers the severity of the offense.1American Bar Association. Rule 3.8 – Special Responsibilities of a Prosecutor State bars adopt their own versions, and violations can draw professional discipline.
Deciding Whether to Bring Charges
A case begins with a charging decision, which is where prosecutors hold the most unchecked power. After an arrest or a referral from law enforcement, the prosecutor reviews police reports, witness statements, forensic results, and other evidence. The question is not only whether a crime occurred but whether the evidence is strong enough to prove it and whether prosecution serves the public interest. Prosecutors regularly decline cases that police considered solid, and that decision is almost never reviewable in court.
How charges are filed depends on the severity of the offense. For misdemeanors and lower-level felonies, the prosecutor can file an “information,” a formal written accusation signed by the prosecutor without a grand jury.2United States Department of Justice. Criminal Resource Manual 201 – Indictment and Informations For serious federal felonies, the Fifth Amendment requires the prosecutor to present the case to a grand jury, which decides whether the evidence is sufficient to issue an indictment.3United States Department of Justice. Charging Grand jury proceedings are sealed, and no judge, defense attorney, or defendant is in the room. The grand jury is not deciding guilt, only whether the case moves forward.
Prosecutors can also drop charges after filing them, through a step called a nolle prosequi. That might happen because evidence turned out to be weaker than it looked, a key witness is lost, or the defendant pleads guilty to different charges.
What the Prosecution Does Before Trial
Bail and Detention
Within a day or two of arrest, a defendant appears before a judge, charges are read, and bail is addressed.4United States Department of Justice. Initial Hearing / Arraignment The prosecutor argues for appropriate release conditions or, in serious cases, asks that the defendant be held. Under federal law, the prosecutor can move for a detention hearing in cases involving violent crimes, major drug offenses, or offenses carrying life imprisonment or the death penalty, presenting evidence about flight risk and danger to the community.5Office of the Law Revision Counsel. 18 U.S. Code 3142 – Release or Detention of a Defendant Pending Trial
Discovery and the Brady Obligation
Both sides exchange evidence before trial. Federal rules require the government to let the defense inspect the defendant’s statements, review the defendant’s prior record, and examine physical evidence the prosecution plans to use.6Legal Information Institute. Federal Rules of Criminal Procedure Rule 16 – Discovery and Inspection
On top of that, the Constitution imposes a separate duty. Under Brady v. Maryland, prosecutors must turn over any evidence favorable to the defendant that is material to guilt or punishment, whether or not the defense asks for it.7Justia Law. Brady v. Maryland, 373 U.S. 83 (1963) That includes evidence that could undermine the credibility of a prosecution witness, a principle the Supreme Court extended in Giglio v. United States.8United States Department of Justice. Justice Manual 9-5.000 – Issues Related to Discovery, Trials, and Other Proceedings This is the area where misconduct most commonly surfaces.
Speedy Trial Deadlines
Prosecutors cannot sit on charges indefinitely. The federal Speedy Trial Act requires trial to begin within 70 days of the indictment or the defendant’s first court appearance, whichever is later.9Office of the Law Revision Counsel. 18 U.S. Code 3161 – Time Limits and Exclusions Time spent on pretrial motions or defense-requested continuances is excluded from the clock. Miss the deadline without a valid exclusion, and the charges can be dismissed. States have their own speedy trial rules with varying timelines.
Plea Bargaining
Most criminal cases end in a plea agreement rather than a trial. The prosecutor typically agrees to reduce charges, drop counts, or recommend a lighter sentence in exchange for a guilty plea.10Legal Information Institute. Federal Rules of Criminal Procedure Rule 11 – Pleas The agreement is disclosed in open court, and the judge can accept it, reject it, or defer a decision until after reviewing a presentence report. Some plea deals bind the court to a specific sentence; others involve only a prosecutor’s recommendation that the judge is free to ignore. A prosecutor who promises to “recommend” probation has not promised the defendant will get it.
Duties to Victims
The prosecution has real obligations to crime victims that shape how plea and sentencing stages unfold. Under the Crime Victims’ Rights Act, prosecutors must make best efforts to notify victims of their rights, inform them about significant case developments, and give them a reasonable chance to confer about key decisions.11Office of the Law Revision Counsel. 18 U.S. Code 3771 – Crime Victims’ Rights Victims are entitled to be heard at sentencing and parole hearings.
The duty to confer carries particular weight on plea deals. Department of Justice guidelines require prosecutors to consult with victims before finalizing a plea agreement and to notify them of the agreement with enough lead time to exercise other rights, such as speaking at a plea hearing.12United States Department of Justice. Attorney General Guidelines for Victim and Witness Assistance Practice varies, but the legal obligation is clear.
At Trial
If a case reaches trial, the prosecution carries the burden of proof. Every element of every charged offense has to be proven beyond a reasonable doubt, the highest standard in American law. The defendant has no obligation to prove anything, call any witnesses, or testify. If the government’s evidence falls short, the jury should acquit. That burden never shifts.
The prosecutor delivers the first opening statement, outlining what the evidence will show. Then the government calls its witnesses, questioning them on direct examination and introducing physical evidence. The defense cross-examines each witness and can object to evidence it believes was improperly obtained or is irrelevant. After both sides present their cases, the prosecutor delivers a closing argument that explains how the evidence proves each element of the charges. The judge then instructs the jury on the law. In federal cases, a guilty verdict must be unanimous.13United States Department of Justice. Trial
After a Conviction
Sentencing
Once a defendant is convicted or pleads guilty, the prosecution turns to sentencing. Federal rules give the prosecutor a chance to address the court at the sentencing hearing.14Legal Information Institute. Federal Rules of Criminal Procedure Rule 32 – Sentencing and Judgment The prosecutor typically argues for a sentence that reflects the seriousness of the crime, the defendant’s criminal history, and the need to deter future offenses and protect the public.15Office of the Law Revision Counsel. 18 U.S. Code 3553 – Imposition of a Sentence Common aggravators include the use of a weapon, targeting a vulnerable victim, or a leadership role in a criminal organization. Even in a plea deal with a locked-in recommendation, the judge can deviate from what the prosecutor asks for.
Restitution
For crimes involving violence, property offenses, fraud, and several other categories, federal law requires the court to order the defendant to pay restitution to victims.16Office of the Law Revision Counsel. 18 U.S. Code 3663A – Mandatory Restitution to Victims of Certain Crimes Restitution can cover medical costs, therapy, lost income, funeral expenses, and the value of destroyed or stolen property. The prosecutor works with the probation office and investigative agents to identify victims and calculate the loss before sentencing.17United States Department of Justice. Restitution Process Restitution is separate from any prison time or fine.
Forfeiture
In cases involving proceeds of crime or property used to commit offenses, the prosecutor can seek forfeiture. After a conviction, the court can enter a preliminary order authorizing the government to seize specified assets.18Legal Information Institute. Federal Rules of Criminal Procedure Rule 32.2 – Criminal Forfeiture The government then publishes notice so anyone with a legitimate claim to the property can come forward. Forfeiture proceedings can continue long after the criminal trial itself ends.
Appeals and the Limit of Double Jeopardy
The prosecution’s work does not end with a conviction. If the defense appeals, the prosecutor defends the conviction by arguing that the trial was conducted properly and the evidence was sufficient. Prosecutors can also bring certain appeals of their own, such as challenging a sentence they believe was unlawfully lenient.
One hard limit: prosecutors generally cannot appeal an acquittal. The Fifth Amendment’s Double Jeopardy Clause prevents the government from retrying someone who has been found not guilty.19Legal Information Institute. Fifth Amendment – Reprosecution After Acquittal If a jury convicts and the trial judge then overturns that verdict, the prosecution can appeal to reinstate the conviction, because reversal would not require a new trial.
Limits on Prosecutorial Power
When prosecutors act as advocates, such as deciding what to present at trial and arguing the case, they have absolute immunity from civil lawsuits. A defendant who was wrongly convicted cannot sue the individual prosecutor for money damages, even if the prosecutor acted recklessly or in bad faith.20Justia Law. Imbler v. Pachtman, 424 U.S. 409 (1976) The Supreme Court reasoned that civil liability for trial decisions would chill prosecutors’ willingness to bring cases.
Immunity from lawsuits is not immunity from everything. Prosecutors can still face criminal prosecution for willful constitutional violations and discipline from their state bar. The most common serious misconduct is withholding favorable evidence in violation of Brady, and the typical remedy when a court finds it is reversal of the conviction. In extreme cases, prosecutors who deliberately hid evidence have faced contempt charges and criminal prosecution.
Ethical rules also impose a post-conviction duty. If a prosecutor later discovers new, credible evidence suggesting a convicted person did not commit the crime, the prosecutor must disclose it to the court and the defendant and investigate further; if the evidence clearly and convincingly shows the conviction was wrong, the prosecutor must seek a remedy.1American Bar Association. Rule 3.8 – Special Responsibilities of a Prosecutor Enforcement of that obligation varies, but it reflects the responsibility prosecutors carry that other lawyers do not.