The Federal Criminal Process & Investigations: A Defendant’s Guide

By Elizabeth Franklin-Best, Esq., and Christopher Zoukis, JD, MBA

A federal criminal case does not begin with an arrest — it begins, often invisibly, with an investigation that may run for months or years before anyone is charged. Understanding the federal criminal process and where your case sits within it is the first step toward defending it. If you are under federal investigation or have been charged, counsel who works in the federal courts every day can tell you precisely where you stand — witness, subject, target, or defendant — and what has to happen next. At Elizabeth Franklin-Best, P.C., we guide and defend clients through the entire federal criminal process nationwide.

This guide maps the federal criminal process from the opening of an investigation through trial — the target letter, the grand jury, the indictment, the arraignment, pretrial detention, plea negotiations, discovery, and trial. Each stage has its own rules, risks, and opportunities for the defense.

Our firm brings a federal-court defense practice grounded in detailed knowledge of federal procedure and controlling case law. Elizabeth Franklin-Best, our principal attorney, enters 2026 recognized on both fronts this work demands: Best Lawyers in America named her a 2026 “Best Lawyer” in Appellate Practice, and Chambers USA 2026 ranks her for Litigation: White-Collar Crime & Government Investigations. We believe an informed client makes better decisions — and that the earlier a defense begins, the more it can accomplish. If you are facing a federal investigation or charge, we invite you to schedule a paid, one-hour initial consultation.

The Federal Criminal Process: Quick Answer

Question	Answer
How does a federal case begin?	Usually, with an investigation — months or years before any charge — by federal agents and prosecutors, often unknown to the person being investigated.
What is a target letter?	A letter from federal prosecutors notifying a person that they are a target of a grand jury investigation. It is a serious signal that should never be ignored.
How are federal charges brought?	A grand jury indictment brings most felony charges; some begin with a criminal complaint or information.
When should I get a lawyer?	As early as possible. The most valuable defense work often happens before charges are ever filed.
How do I get advice specific to my case?	Through a paid, one-hour initial consultation, where we review where your matter sits in the federal process and map what should happen next.

Key Takeaways

• A federal criminal case typically begins with a lengthy investigation, often invisible to the person under investigation.
• Federal felony charges are usually brought by grand jury indictment, though some begin by complaint or information.
• Knowing your status — witness, subject, or target — shapes every decision in the case.
• The pre-charge stage is frequently where a defense can accomplish the most, sometimes preventing charges altogether.
• Key stages include the investigation, the grand jury, indictment, arraignment, pretrial detention, discovery, plea negotiations, and trial.
• The vast majority of federal cases are resolved by plea agreement, but a credible trial defense strengthens every negotiation.
• Constitutional protections — the Fourth, Fifth, and Sixth Amendments — apply at every stage.
• The earlier experienced counsel is involved, the more options a defendant is likely to have.

How a Federal Criminal Case Begins

Federal criminal cases rarely begin the way people expect. There is usually no dramatic moment of arrest at the outset. Instead, a case begins quietly, with an investigation conducted by federal agents from the FBI, DEA, IRS Criminal Investigation, Homeland Security Investigations, an inspector general’s office, or another agency, working with federal prosecutors. That investigation can run for months or years, gathering documents, financial records, and witness testimony, often without the person under investigation knowing it is happening.

The federal system also moves differently from state systems. Federal investigations are typically more thorough and better resourced; federal grand juries play a central role; and the United States Sentencing Guidelines and mandatory minimums shape outcomes in ways that have no state equivalent. A person facing the federal system for the first time is facing an unfamiliar and formidable process.

This guide is the map. It walks through each stage of the federal criminal process, and each stage is covered in depth in its own linked guide. The goal is to help defendants and their families understand where a case stands, what is coming, and where the defense can act.

The Investigation Stage

The investigation is the longest and, for the defense, often the most important stage of a federal case. During this period, the government builds its case — and, if the defense is involved early, can shape it.

• Federal Criminal Investigations — how federal investigations work, the agencies involved, and the signs that you may be under investigation.
• Federal Target Letters — what a target letter means, the difference between a witness, a subject, and a target, and how to respond.
• Grand Jury Subpoenas & the Grand Jury Process — how the federal grand jury works and what to do when served with a subpoena.
• Federal Search Warrants & the Fourth Amendment — search warrants, the limits the Constitution places on them, and the motion to suppress.
• Civil Investigative Demands (CIDs) — the civil investigative tool that often runs parallel to, or precedes, a criminal case.
• False Claims Act & Qui Tam Defense — the civil and criminal false-claims framework, the qui tam whistleblower mechanism, and the parallel-proceedings risk behind most fraud investigations.

The single most important concept at this stage is status. In a federal investigation, a person is generally a witness, a subject, or a target. A witness has information but is not suspected of wrongdoing. A subject is someone whose conduct is within the scope of the investigation. A target is someone the prosecutor believes can be charged. Status can change, and knowing where you stand drives every decision — whether to speak with investigators, how to respond to a subpoena, and whether to engage with prosecutors before a charging decision is made.

Applied Insight: The pre-charge window is the most underused opportunity in federal practice. Before an indictment, a defense can gather favorable evidence, correct the government’s factual misunderstandings, and — in the right case — present prosecutors with reasons not to charge at all. Once an indictment is returned, that window largely closes.

Inside the Federal Grand Jury

Because nearly every federal felony passes through it, the grand jury deserves a closer look. Under Rule 6 of the Federal Rules of Criminal Procedure, a federal grand jury is composed of 16 to 23 citizens, and an indictment may be returned only if at least 12 jurors concur. The standard the grand jurors apply is probable cause — not proof beyond a reasonable doubt — which is one reason the overwhelming majority of cases presented to federal grand juries end in an indictment.

The proceeding is one-sided by design. The prosecutor decides which witnesses and documents the grand jurors see, questions the witnesses, and explains the law. No judge sits in the room, and defense counsel is not permitted inside — a witness may step out to consult with a lawyer, but the lawyer cannot attend the testimony. Rule 6(e) imposes strict secrecy on the grand jurors, the prosecutors, and court personnel, though notably not on witnesses, who remain free to tell the defense what they were asked.

For the defense, the grand jury stage is mostly about what happens outside the room: negotiating the scope of subpoenas, preparing witnesses for testimony, asserting privileges, and reading the investigation’s direction from what the government asks for. Handled well, that work feeds directly into the pre-charge advocacy described above.

The Charging Stage

When the government decides to proceed, the case enters the charging stage. Most federal felonies are charged by a grand jury indictment — a formal accusation returned by a grand jury that found probable cause. Some cases begin with a criminal complaint, and some defendants are charged by information, typically when they have agreed to waive indictment as part of a resolution.

• Federal Indictment: What Happens Next — what an indictment is, how to read it, sealed indictments, and the steps that follow.
• Arrest, Initial Appearance & Arraignment — the arrest, the first court appearance, and the entry of a plea.
• Pretrial Detention & the Bail Reform Act — the detention hearing and the fight over whether a defendant is released pending trial.

The charging stage moves quickly once it begins. An arrest is followed shortly by an initial appearance, and the question of pretrial release or detention is decided early. Having counsel in place before this stage — or engaged immediately when it arrives — is critical.

Pretrial Detention: How the Bail Reform Act Decides Release

Whether a defendant goes home after the initial appearance is governed by the Bail Reform Act, 18 U.S.C. § 3142, and the statute works in two distinct steps. The first step is a threshold question: a detention hearing may be held only in the categories of cases listed in § 3142(f) — on the government’s motion, in cases involving a crime of violence, an offense carrying a maximum of life imprisonment or death, a drug offense with a ten-year-or-greater maximum, certain repeat offenders, or certain felonies involving minors or firearms; or under § 3142(f)(2), on the motion of the government or the court, where the case involves a serious risk of flight or a serious risk of obstruction or witness intimidation. If none of those grounds exists, detention is simply unavailable, and the only question is which conditions of release apply.

Only when a hearing is properly triggered does the second step begin: the judge weighs the factors in § 3142(g) — the nature and circumstances of the offense, the weight of the evidence, the defendant’s history and characteristics (family, employment, finances, community ties, criminal record, and any supervision status), and the nature and seriousness of any danger release would pose. A detention order resting on dangerousness requires clear and convincing evidence. In United States v. Salerno, 481 U.S. 739 (1987), the Supreme Court upheld this framework against facial attack, reasoning that detention under the Act is a regulatory measure imposed after an adversary hearing — not punishment before trial.

The two-step structure matters enormously in white-collar cases. Most fraud and financial-crime charges fall outside the § 3142(f)(1) categories, so the government usually cannot seek detention at all unless it can credibly argue a serious risk of flight — foreign assets, dual citizenship, conduct suggesting concealment — or obstruction. Pressing that threshold question, before the court ever reaches the (g) factors, is often the defense’s strongest move at this stage.

The Speedy Trial Act’s 70-Day Clock

Once charges are filed, the Speedy Trial Act, 18 U.S.C. § 3161, sets the timetable. An indictment or information must be filed within 30 days of an arrest on a complaint, and trial must commence within 70 days of the filing of the indictment or the defendant’s first appearance before the court where the charge is pending, whichever comes later.

Seventy days sounds short because it is — and the statute accounts for that through exclusions. Time consumed by pretrial motions, competency proceedings, interlocutory appeals, and delay attributable to codefendants does not count toward the clock, and a court may grant an “ends of justice” continuance when it finds, on the record, that the interests served by the delay outweigh the public’s and the defendant’s interest in a speedy trial. The Supreme Court enforced those requirements strictly in Zedner v. United States, 547 U.S. 489 (2006), holding that a defendant cannot prospectively waive the Act and that a continuance unsupported by on-the-record findings cannot be excused as harmless error.

When the unexcluded days run out, the remedy is dismissal under § 3162 — with or without prejudice, depending on the seriousness of the offense, the circumstances of the violation, and the impact on the administration of justice. In document-heavy white-collar prosecutions, both sides frequently need time, and the clock becomes a strategic instrument: the defense must decide, case by case, whether speed or preparation serves the client better.

The Pretrial Stage

Between arraignment and trial lies the pretrial stage, where much of the real work of a federal case is done. The defense reviews the government’s evidence, litigates legal issues, and — in most cases — explores resolution.

• Federal Pretrial Motions & Motions to Suppress — the motion to suppress evidence and the other pretrial motions that test the government’s case before trial.
• Federal Discovery & Brady Material — the evidence the government must disclose, including exculpatory Brady material.
• Federal Plea Agreements — the types of plea agreements and how they work under Rule 11.
• Proffer Sessions & “Queen for a Day” Agreements — the proffer session and its risks and benefits.
• Cooperation & Substantial Assistance — how cooperation works and how it can reduce a sentence.

The pretrial stage is also where the defense files motions to suppress unlawfully obtained evidence, dismiss defective charges, and resolve evidentiary disputes. A motion to suppress that excludes the government’s central evidence can end a case before trial.

Discovery: What the Government Must Disclose

Federal criminal discovery is narrower than civil discovery, but four overlapping obligations give the defense real leverage. Rule 16 requires the government to produce the defendant’s own statements and criminal record, documents and objects material to preparing the defense, examination and test results, and summaries of expert testimony. Brady v. Maryland, 373 U.S. 83 (1963), requires disclosure of evidence favorable to the accused that is material to guilt or punishment — an obligation that applies whether or not the prosecutors acted in good faith.

Giglio v. United States, 405 U.S. 150 (1972), extends that duty to impeachment evidence — including promises of leniency made to cooperating witnesses — and attributes a promise made by any prosecutor in the office to the government as a whole. The Jencks Act, 18 U.S.C. § 3500, governs witness statements, which the government technically need not produce until after the witness testifies, though earlier production is common in practice and is often negotiated.

Since 2020, the Due Process Protections Act has added a procedural backstop: under Rule 5(f), the judge at the first appearance must issue an oral and written order confirming the government’s disclosure obligations under Brady and the consequences of violating them. Our approach treats discovery as offense rather than paperwork — specific, documented demands, litigated when the government resists, with a record built for appeal if it comes to that.

Plea Agreements Under Rule 11 — and the 98 Percent Reality

The United States Sentencing Commission’s fiscal year 2025 data show that 98 percent of sentenced federal defendants were convicted by guilty plea. That figure describes the terrain every federal defendant must navigate, but it decides nothing about any individual case — pleas happen on terms, and the terms vary enormously with the quality of the defense work behind them.

Rule 11(c)(1) recognizes three structures for a federal plea agreement. Under subsection (A), the government agrees to dismiss or not bring particular charges. Under subsection (B), it agrees to recommend — or not oppose — a particular sentence or Guidelines position, a recommendation that does not bind the court. Under subsection (C), the parties agree that a specific sentence or sentencing range is the appropriate disposition, and that agreement binds the court once it accepts the plea agreement. The judge may not participate in the negotiations themselves.

Before accepting any plea, the court must conduct a colloquy confirming that the plea is knowing and voluntary, that the defendant understands the rights being given up and the penalties faced, and that a factual basis supports every element of the offense. The structure chosen matters: a binding (C) agreement buys certainty but risks rejection by the court, while a (B) agreement preserves judicial discretion in both directions. We treat that choice as a sentencing decision, made with the endgame in view from the first negotiation.

Trial and Resolution

Most federal cases are resolved by plea agreement rather than trial. But that statistic should not be misread. A defendant always has the right to a trial, and the strength of a potential trial defense shapes every plea negotiation. A defense that is genuinely prepared to try the case negotiates from a position of strength.

• The Federal Criminal Trial Process — jury selection, the burden of proof, the presentation of evidence, and the verdict.
• Federal Extradition Defense — how a defendant located in another country may be brought to face federal charges, and how extradition is contested.

If a case results in a conviction, by plea or by verdict, it proceeds to sentencing — a stage so important in the federal system that it is the subject of its own detailed body of guidance. And a conviction is not necessarily the end: the federal system provides for direct appeals and for post-conviction relief.

Applied Insight: The high rate of guilty pleas in the federal system does not mean trial is irrelevant — the opposite. A defense that has done the work to be trial-ready, that has litigated the suppression motions and tested the government’s proof, is the defense that negotiates the best resolutions. Preparation for trial and effective negotiation are not alternatives; they are the same effort.

Your Rights Throughout the Process

Constitutional protections apply at every stage of the federal criminal process, and a defense exists to enforce them. The Fourth Amendment governs searches and seizures and supports the suppression of unlawfully obtained evidence. The Fifth Amendment protects the right to remain silent, guarantees due process, and bars double jeopardy. The Sixth Amendment guarantees the right to counsel, to a speedy and public trial, to an impartial jury, and to confront the government’s witnesses.

These rights are not self-executing. They protect a defendant only when they are asserted and enforced — when counsel declines an improper interview, files the suppression motion, demands the discovery the government owes, and holds the prosecution to its burden of proof beyond a reasonable doubt. That enforcement is the work of the defense.

How Recent Supreme Court Decisions Have Reshaped Federal Procedure

The federal criminal process is not static — the Supreme Court’s 2024 Term narrowed several statutes that prosecutors rely on, and those changes ripple through charging decisions, jury instructions, and sentencing exposure. The decisions below are now controlling law, and a defense that tracks them can sometimes reframe or defeat charges that would have stood a few years ago. This is one reason the early, fact-specific work described throughout this guide matters: the governing rules shift, and the analysis has to be current.

In Snyder v. United States, 603 U.S. 1 (2024), the Court held that 18 U.S.C. § 666 criminalizes bribes but not after-the-fact gratuities to state and local officials — a distinction that reshapes how the government must prove corrupt intent and that can narrow the conduct chargeable in public-corruption cases. In Fischer v. United States, 603 U.S. 480 (2024), the Court read the obstruction statute, 18 U.S.C. § 1512(c)(2), to reach only conduct that impairs the availability or integrity of records, documents, or objects for use in an official proceeding, cutting back an offense the government had applied expansively. Both decisions show how a statute’s text can foreclose a theory of prosecution well into a case.

The Court has also clarified the limits of constitutional challenges. In United States v. Rahimi, 602 U.S. 680 (2024), it upheld the firearms prohibition for persons subject to certain domestic-violence restraining orders, holding that the Second Amendment framework of New York State Rifle & Pistol Ass’n v. Bruen, 597 U.S. 1 (2022), does not invalidate every firearms restriction so long as the government can point to an analogous historical tradition. The lesson across these cases is consistent: the contours of federal criminal liability move, and the defense’s job is to test every charge against the law as it stands today, not as it stood when the statute was written.

Why Work With Elizabeth Franklin-Best, P.C.?

The federal criminal process is complex, fast-moving once it accelerates, and unforgiving of missed opportunities. It rewards defense counsel who understand every stage, who act early, and who know when the defense can change the trajectory of a case.

Elizabeth Franklin-Best, our principal attorney, is a federal criminal defense and appellate attorney and the author of Reversing Your Criminal Conviction. She is admitted to the U.S. Supreme Court and to all twelve federal circuit courts of appeals, and she appears pro hac vice in district courts nationwide alongside her standing bar admissions. Over the course of her career she has handled more than 330 federal proceedings — over 100 of them appeals — spanning the trial courts, every federal circuit, and the certiorari stage at the Supreme Court, with a practice that runs from pre-charge investigations and trial defense through sentencing, direct appeals, and post-conviction litigation. That full-lifecycle vantage is the point of this guide: we have stood at each stage described above, and we know where the defense can change a case.

Our Managing Director, Christopher Zoukis, JD, MBA — a non-attorney who focuses on federal sentencing and corrections — helps clients and families understand what a federal sentence actually involves, so the strategy accounts for the months and years after a courtroom result. No lawyer can tell you in advance how a federal case will end, and you should be wary of any who claims to. What we can tell you — concretely, after reviewing your situation — is where your case sits in this process, which doors remain open, and what we would do next if we were defending you. That conversation begins with a paid, one-hour initial consultation.

Talk With a Federal Criminal Defense Attorney

Wherever your case sits in the federal criminal process — a quiet investigation, a target letter, an indictment, or a looming trial — every stage described above is a stage where the right move matters. Bring us your facts, and we will place them on this map and tell you candidly what comes next. To start that conversation, schedule your paid, one-hour initial consultation today.