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Key Facts
- Different clients: A prosecutor represents the government; defense counsel represents the accused person.
- Different burdens: The prosecution must prove every fact necessary to constitute the charged crime beyond a reasonable doubt.
- Defense need not prove innocence: The defense may test the government’s proof, litigate legal issues, present evidence, negotiate, or advise a plea.
- Federal roles: Federal statutes assign prosecution duties to U.S. attorneys and provide appointed counsel for financially eligible defendants in covered cases.
- State systems differ: California separately states district-attorney prosecution duties and rules for appointing defense counsel.
“Defense versus prosecution” describes opposing functions in an adversarial criminal case, not two interchangeable kinds of attorney. Both sides work within constitutional, statutory, evidentiary, and professional constraints, but they represent different interests.
A prosecutor presents the government’s case. Defense counsel protects the accused person’s rights and advances that client’s lawful objectives. A focused guide to a prosecutor and a separate overview of a defense attorney examine each role individually.
Who each side represents
In federal court, 28 U.S.C. § 547 directs each United States attorney, subject to the Attorney General’s direction, to prosecute federal offenses within the district. The prosecutor represents the United States, not an individual victim.
Defense counsel represents the defendant. Under 18 U.S.C. § 3006A, financially eligible people are entitled to appointed representation in listed federal proceedings, including felony and Class A misdemeanor cases.
Private defense counsel and appointed counsel have the same basic client relationship, although appointment, funding, and administration differ. The lawyer’s task is representation, not deciding guilt.
The prosecution carries the criminal burden
In In re Winship, the U.S. Supreme Court held that due process protects an accused person against conviction except upon proof beyond a reasonable doubt of every fact necessary to constitute the charged crime.
That burden belongs to the prosecution. A defendant may challenge whether the government has carried it without proving an alternative account or taking the witness stand.
Burden of proof should not be confused with burdens attached to particular motions, defenses, or evidentiary questions. Those issues depend on the governing jurisdiction and rule.
What prosecutors do
Under 28 U.S.C. § 547, each United States attorney has the duty to prosecute federal offenses within the district, subject to the Attorney General’s direction.
Federal Criminal Rule 7 generally requires an indictment for a federal felony unless indictment is waived, and Rule 11 governs federal pleas. Rule 16 separately governs specified federal criminal discovery obligations.
Federal Rules 7, 11, and 16 govern federal procedure and do not themselves establish California criminal procedure.
What defense attorneys do
Section 3006A provides appointed representation for financially eligible defendants in listed federal proceedings and specifies when that representation begins and ends. A defendant may challenge whether the prosecution has proved every necessary fact beyond a reasonable doubt.
Federal Rule 11 requires the federal court to address the defendant personally and determine that a guilty or nolo contendere plea is voluntary and supported as the rule requires.
Federal Rules 11 and 23 respectively govern the federal plea colloquy and jury or nonjury modes of trial. The broader criminal defense attorney guide covers representation in more depth.
Discovery is not identical for both sides
Federal Rule 16 lists information the government must disclose on request, including specified defendant statements, records, documents, objects, reports, and expert evidence. It also creates reciprocal defense disclosure duties for certain evidence when its conditions are met.
The rule contains limitations and protective-order provisions. A federal Rule 16 discovery dispute therefore requires review of the applicable subsection and any protective order.
Plea discussions and trial
Rule 11 permits federal plea agreements with specified forms of prosecutorial promises or recommendations, but the court must follow the rule’s acceptance and disclosure procedures. A negotiated agreement is not effective merely because lawyers discussed it.
If a case proceeds to trial, the defense may argue that the government has failed to prove every fact necessary to constitute the charged crime beyond a reasonable doubt.
Federal Rule 23 provides for federal jury trials and specifies conditions for waiver of a jury and for a nonjury trial.
California shows the state-law boundary
California Government Code section 26500 requires the district attorney to attend specified courts and conduct prosecutions for public offenses on behalf of the people. That is a California office and duty, not the federal U.S.-attorney structure.
California Penal Code section 987 addresses counsel at arraignment. In covered cases, it requires the court to inform an unrepresented defendant of the right to counsel and, when the defendant desires but cannot employ counsel, to assign counsel as the statute provides.
California’s provisions illustrate the parallel roles, but they do not prove appointment or prosecution rules in another state. Other jurisdictions require separate review.
Common misconceptions
A prosecutor is not the victim’s personal lawyer, and defense counsel does not have to endorse alleged conduct to provide representation. The adversarial system assigns each lawyer a role while leaving adjudication to the court and factfinder.
An arrest or charge is not a conviction. Likewise, a dismissal, acquittal, plea, and conviction are different outcomes that should be described with the correct procedural term.
The most reliable comparison identifies the jurisdiction, procedural stage, charging document, applicable rules, and whether counsel is private or appointed. Those details matter more than television shorthand about “winning sides.”
