The stages of criminal procedure from arrest to appeals run in a predictable order: arrest, initial appearance and bail, formal charging by preliminary hearing or grand jury, plea negotiations or pretrial discovery and motions, trial, sentencing, and finally direct appeal and post-conviction review. Most cases never reach the later stages. Roughly 90 to 95 percent of federal and state prosecutions end with a plea agreement rather than a trial verdict.1Bureau of Justice Assistance. Plea and Charge Bargaining Research Summary Each stage has its own rules, deadlines, and decision points, and understanding what happens at each is the difference between reacting to the process and being able to see what is coming next.
Arrest
A criminal case formally begins when police take someone into custody. To make an arrest, officers need probable cause, meaning enough factual evidence that a reasonable person would believe a crime occurred and the person arrested committed it. This is a higher standard than the reasonable suspicion needed for a brief investigative stop, which the Supreme Court authorized in Terry v. Ohio.2Justia U.S. Supreme Court Center. Terry v. Ohio, 392 U.S. 1 (1968)
The way police gather evidence before and during arrest matters because it shapes what can later be used at trial. The Fourth Amendment generally requires a warrant to search a home, though several exceptions apply: consent, a search incident to a lawful arrest, the automobile exception when officers have probable cause to believe a vehicle contains evidence, exigent circumstances, and plain view.3Constitution Annotated. Amdt4.6.5.1 Terry Stop and Frisks Doctrine and Practice If officers overstep, the defense can later move to suppress whatever they found.
Once someone is in custody, police must give Miranda warnings before interrogation: the right to remain silent, that anything said can be used against them, and the right to an attorney.4Constitution Annotated. Amdt5.4.7.5 Miranda Requirements Statements taken during custodial interrogation without those warnings are generally inadmissible. Volunteered statements and answers given in casual conversation before arrest are a different matter and can usually come in.
Booking follows. Name, photograph, and fingerprints go into the record, and in many jurisdictions that information becomes public almost immediately.
Initial Appearance and Bail
Federal rules require that an arrested person be brought before a judge without unnecessary delay, and most jurisdictions aim to hold this first hearing within 48 hours.5Legal Information Institute. Federal Rules of Criminal Procedure Rule 5 – Initial Appearance At the initial appearance, the judge confirms identity, states the charges, and reviews whether probable cause supported the arrest. A defendant who cannot afford a lawyer typically has counsel appointed at or shortly after this hearing.
The main event at this stage is bail. In federal court, judges weigh the seriousness of the charges, the weight of the evidence, the defendant’s personal history and community ties, and whether release would endanger anyone.6Office of the Law Revision Counsel. 18 USC 3142 – Release or Detention of a Defendant Pending Trial Outcomes range from release on personal recognizance to a cash bond to outright detention for serious violent offenses.
Release usually comes with conditions: travel limits, check-ins with a pretrial services officer, drug testing, curfew, or electronic monitoring. Violations mean going back into custody and losing credibility with the judge for the rest of the case.
Formal Charging
Before a case moves toward trial, prosecutors have to clear an evidentiary screen showing the charges have a basic factual foundation. This happens one of two ways.
Preliminary Hearing
In many jurisdictions, the prosecutor files a written accusation and a judge holds a preliminary hearing. The standard is far below the trial standard of beyond a reasonable doubt. The judge only decides whether a reasonable person could conclude that a crime occurred and the defendant committed it. Defense attorneys can cross-examine the prosecution’s witnesses, and the hearing sometimes reveals enough about the government’s case to be useful to the defense even when the charges survive.
Grand Jury
The Fifth Amendment requires a grand jury indictment for federal felony prosecutions.7Constitution Annotated. Amdt5.2.2 Grand Jury Clause Doctrine and Practice That requirement has not been extended to the states, so state prosecutors can use either a grand jury or a preliminary hearing. Grand juries are made up of citizens who hear evidence in secret proceedings run by the prosecutor. The defense has no right to be present or to cross-examine. If the grand jury finds sufficient evidence, it returns an indictment.
Plea Bargaining
This is where most criminal cases actually end. A plea bargain is a negotiated agreement: the defendant pleads guilty, usually to a reduced charge or in exchange for a specific sentencing recommendation, and the case resolves without trial. Charge bargaining reduces or drops counts; sentence bargaining trades a plea for a lighter recommendation. A single deal can involve both.
Before accepting a guilty plea, the judge must speak directly with the defendant and confirm the plea is voluntary, that the defendant understands the rights being waived (including the jury trial right and the right against self-incrimination), and that a factual basis exists for the plea.8Legal Information Institute. Federal Rules of Criminal Procedure Rule 11 – Pleas The judge must also explain the maximum sentence, any mandatory minimum, and consequences of the plea, including possible deportation for a noncitizen. That on-the-record exchange exists to keep coerced or uninformed pleas out of the system.
A plea often includes waiving the right to appeal. Once accepted, that makes the conviction essentially final. Defendants who take a deal without understanding what they gave up frequently learn the cost later.
Discovery and Pretrial Motions
Cases that keep moving toward trial enter a phase of exchanging evidence and litigating what will be allowed in. Discovery covers witness lists, police reports, forensic results, and recorded statements. The goal is to prevent surprise at trial.
The prosecution carries a specific constitutional duty. Under Brady v. Maryland, prosecutors must turn over any evidence favorable to the defense that is material to guilt or punishment, whether or not the defense asks for it.9Library of Congress. Brady v. Maryland, 373 U.S. 83 (1963) That includes evidence pointing to innocence and evidence undermining a government witness’s credibility. Brady violations remain a leading cause of wrongful convictions.
This is also when defense attorneys file motions that can reshape the case. A motion to suppress asks the judge to exclude evidence obtained through an illegal search or a Miranda violation. If the judge agrees, the exclusionary rule keeps that evidence out.10Constitution Annotated. Amdt4.7.1 Exclusionary Rule and Evidence Losing key evidence often forces the government to reduce charges or dismiss. Other motions can change the trial venue, exclude prejudicial testimony, or attack the legal sufficiency of the charges.
Speedy Trial Deadlines
The Sixth Amendment guarantees a speedy trial, and in federal court the Speedy Trial Act sets concrete numbers. The government must file formal charges within 30 days of arrest, and trial must begin within 70 days of charging or first court appearance, whichever is later.11Office of the Law Revision Counsel. 18 USC 3161 – Time Limits and Exclusions A defendant also cannot be forced to trial in fewer than 30 days, which protects preparation time.
The clock has exceptions. Time spent on pretrial motions, mental health evaluations, or defense-requested continuances does not count. Complex cases with multiple defendants routinely stretch well past 70 days once excluded time is added up. State rules follow a similar pattern of deadlines with tolling. If the government misses the deadline without a valid exclusion, the charges must be dismissed.
The Trial
Jury Selection
Trial begins with voir dire, the process of questioning potential jurors to identify bias. Each side can strike jurors for cause when a specific reason shows the person cannot be fair, and each side gets a limited number of peremptory challenges to remove jurors without stating a reason. Peremptory challenges cannot be used to exclude jurors based on race or sex.
Opening Statements and Evidence
Once the jury is seated, both sides deliver opening statements previewing their evidence. The prosecution goes first because it carries the burden of proof, and it presents its case first, calling witnesses and introducing physical evidence. The defense cross-examines each prosecution witness. After the prosecution rests, the defense may put on its own case, though the defendant has an absolute right not to testify, and jurors are instructed that silence cannot be held against the defendant.
The government must prove every element of every charged offense beyond a reasonable doubt. That is the highest standard in the legal system. If the evidence leaves a reasonable person unsure, the verdict should be not guilty.
Verdict
After closing arguments, the judge instructs the jury on the law. The jury deliberates in private. Since Ramos v. Louisiana in 2020, the Sixth Amendment requires a unanimous verdict to convict on serious offenses in both federal and state court.12Supreme Court of the United States. Ramos v. Louisiana, 590 U.S. 83 (2020) A single holdout produces a hung jury and a mistrial, and the prosecution then decides whether to retry.
Sentencing
A conviction, whether by plea or verdict, is followed by a separate sentencing hearing. The judge reviews a presentence investigation report prepared by a probation officer, covering criminal history, personal background, employment, family situation, and the circumstances of the offense. Both sides argue, and victims can submit impact statements.
Federal courts use sentencing guidelines that produce a recommended range based on offense severity and prior record. State systems vary but follow similar structures. Judges can impose prison, fines, restitution to victims, community service, or probation. For some offenses, mandatory minimums remove judicial discretion and require a set floor regardless of the circumstances.
Appeals and Post-Conviction Review
Direct Appeal
After sentencing, the deadline to file a notice of appeal is short. In federal criminal cases it is 14 days from entry of judgment.13Legal Information Institute. Federal Rules of Appellate Procedure Rule 4 – Appeal as of Right, When Taken State deadlines vary but often fall between 14 and 30 days. Missing the window forfeits the direct appeal.
An appellate court does not retry the case or hear new evidence. It reviews the trial record for legal errors: wrong jury instructions, improperly admitted evidence, undisclosed Brady material, and similar problems. The court can affirm, reverse, or send the case back for a new trial. Most convictions are affirmed, but a significant error that affected the outcome can produce real relief.
Post-Conviction Motions
After direct appeals are exhausted, a federal prisoner can file a motion under 28 U.S.C. ยง 2255 arguing that the sentence violated the Constitution or federal law, the court lacked jurisdiction, the sentence exceeded the legal maximum, or the conviction is otherwise subject to challenge.14Office of the Law Revision Counsel. 28 USC 2255 – Federal Custody, Remedies on Motion Attacking Sentence A one-year statute of limitations runs from the date the conviction became final.
Actual innocence claims can overcome the one-year deadline, but the bar is high. A petitioner must present new, reliable evidence showing that no reasonable juror would have convicted in light of all the evidence available. The Supreme Court has described successful actual innocence claims as rare. State prisoners have parallel post-conviction procedures with their own rules and deadlines.
The Constitutional Backbone
Every stage above traces to the Bill of Rights. The Fourth Amendment governs searches and seizures. The Fifth Amendment protects against self-incrimination, requires grand jury indictment for serious federal charges, and bars double jeopardy. The Sixth Amendment guarantees a speedy and public trial, notice of the charges, confrontation of witnesses, and the right to counsel.15Cornell Law Institute. Bill of Rights The Fourteenth Amendment extends most of these protections to state prosecutions through incorporation, which matters because most criminal cases are prosecuted in state court. These provisions set the floor beneath which no prosecution, at any stage, can fall.