What Does the Prosecution Do in a Criminal Case?
In a criminal case, the prosecution represents the government—not the individual victim—and must prove the defendant’s guilt beyond a reasonable doubt. Prosecutors make decisions about charges, present evidence in court, and may negotiate plea agreements. Their work also carries important limits: they must follow constitutional rules, disclose certain evidence to the defense, and seek justice rather than simply a conviction. The exact process varies by state and federal court, but the prosecution’s central role is consistent across the United States.
Many criminal cases are resolved without a trial through a guilty plea. A plea agreement may involve a defendant pleading guilty to certain charges, the prosecution dismissing or reducing others, or the parties making recommendations about a sentence. The terms depend on the case and applicable law.
The prosecutor may negotiate with the defense, but a judge typically must make sure a guilty plea is voluntary and legally valid. A judge may be bound by some parts of an agreement or may have discretion over the sentence, depending on the jurisdiction and agreement. A defendant generally has the right to consult with a lawyer and must understand the consequences of pleading guilty.
Plea discussions can reduce the time and uncertainty involved in a trial, but an offer is not proof of guilt. The prosecutor must still act within the law and applicable policies. Victims may have rights to notice or an opportunity to be heard under certain laws, but they generally do not have the authority to dictate the terms of a plea agreement.
What the Prosecution Does at Sentencing
If a defendant is convicted or pleads guilty, the case may proceed to sentencing. The prosecution can present information relevant to the sentence and may recommend a particular outcome. The defense can present its own arguments, and the judge decides the sentence under the governing law.
Sentencing may take account of factors such as the seriousness of the offense, the defendant’s history, harm to victims, statutory limits, and applicable sentencing guidelines. The rules vary between federal and state courts. The prosecution’s recommendation is not necessarily the sentence the judge will impose.
A victim may have a right to be notified of certain proceedings or to provide a statement, depending on the jurisdiction and case. Federal rights are described in the Crime Victims’ Rights Act. These rights do not turn the victim into the prosecutor or determine the verdict.
What Does the Prosecution Not Do?
The prosecution does not decide guilt by itself. In a jury trial, the jury determines whether the evidence proves guilt beyond a reasonable doubt; in a bench trial, the judge performs that role. The prosecutor presents the government’s case but does not control the judge’s rulings or the jury’s verdict.
The prosecution also does not represent the defendant or provide the defendant with legal advice. The defense attorney represents the accused and may investigate the case, challenge the government’s evidence, negotiate with the prosecutor, and advocate at trial. When a defendant cannot afford a lawyer and qualifies under the law, a court may appoint counsel.
Nor should a prosecutor conceal material evidence favorable to the defense, knowingly present false testimony, or make improper arguments. The Supreme Court has described the prosecutor’s role as seeking justice, not merely winning a case. In Berger v. United States, the Court emphasized the special responsibility of government counsel to ensure that a criminal trial is fair.
State and Federal Prosecutions
Most criminal cases are handled in state courts under state law. Local prosecutors commonly handle offenses such as theft, assault, and many traffic-related crimes, though the precise division of responsibilities differs by state. Federal prosecutors bring cases involving federal statutes and other matters within federal jurisdiction, such as certain interstate offenses, federal crimes, or crimes on federal property.
Some conduct may violate both state and federal law, but the two systems are separate and have different courts, procedures, and sentencing rules. A case’s jurisdiction is determined by law, not simply by which prosecutor appears to have greater authority. For official information about federal prosecution, the U.S. Department of Justice provides resources through its U.S. Attorneys’ Offices.
How Prosecutors Are Held Accountable
Prosecutors must comply with constitutional requirements, statutes, professional conduct rules, court orders, and office policies. Judges can exclude evidence, order remedies for violations, or take other actions authorized by law. A conviction may be challenged through an appeal or other post-conviction process, although the available grounds and deadlines are strict.
Prosecutors may also face internal review or professional discipline for misconduct. The exact oversight process varies by state and office. A defendant who believes that evidence was withheld or that a legal error occurred should discuss the matter with a defense attorney, who can assess available motions or appeals. Not every disagreement with a charging decision or courtroom argument amounts to misconduct.
Prosecution and Defense: Key Differences
| Role | Prosecution | Defense |
|---|---|---|
| Represents | The government and public interest | The accused person |
| Main trial task | Prove each charge beyond a reasonable doubt | Challenge the evidence and protect the client’s rights |
| Evidence duties | Present admissible evidence and disclose required information | Review disclosures, investigate, and present a defense when appropriate |
| Outcome decision | Does not decide guilt | Does not decide guilt |
The prosecution’s role is therefore both powerful and limited. It chooses whether to pursue charges and presents the government’s case, but it must operate within rules designed to protect a fair process. The judge or jury—not the prosecutor—decides whether the charges have been proven.