Discovery in a criminal case can take anywhere from a few weeks for a straightforward misdemeanor to more than a year for a complex federal prosecution involving financial records, forensic testing, or multiple defendants. In federal court, the Speedy Trial Act requires trial to begin within 70 days of indictment or the defendant’s first court appearance, but time spent on pretrial motions, forensic analysis, and agreed continuances is excluded from that count. The actual elapsed time usually runs much longer than 70 days, and how long depends on what has to be exchanged, how cooperative the parties are, and whether lab results or expert reports are in the mix.
What Drives the Timeline
The rules set the framework. Practical realities set the pace. A handful of factors do most of the work in determining whether discovery wraps up in a month or drags on past a year.
- Case complexity. A shoplifting charge with one police report and a store surveillance clip can move through discovery in weeks. A federal fraud prosecution involving years of financial records, shell companies, and cooperating witnesses can keep discovery open for a year or more. Homicide cases land somewhere in between, depending on how much forensic evidence and expert testimony is involved.
- Volume of evidence. Digital evidence is where timelines balloon. A single seized computer or phone can hold terabytes of data that have to be extracted, searched, and reviewed. Thousands of pages of financial records or months of recorded calls take real time to go through on both sides.
- Forensic lab backlogs. DNA analysis alone can take anywhere from weeks to over a year once samples reach the lab, depending on backlog and sample complexity. Ballistics, fingerprint, and toxicology work faces similar delays. Neither side can really close out discovery until those results come back.1National Institute of Justice. Principles of Forensic DNA for Officers of the Court – How Long Will It Take
- Multiple defendants. Each defense team reviews the same evidence pool, but scheduling conflicts multiply. Disagreements among co-defendants about strategy create extra motions. A two-defendant case moves noticeably slower than the same case with one defendant.
- Expert witnesses. Both sides may retain forensic accountants, medical experts, or digital forensics specialists. Federal Rule 16 requires written summaries of each expert’s opinions, reasoning, qualifications, and prior testimony, signed by the expert. Preparing those summaries takes time, and in-demand experts aren’t always available on the court’s preferred schedule.2Legal Information Institute. Federal Rules of Criminal Procedure Rule 16 – Discovery and Inspection
The 70-Day Clock and Why It Rarely Means 70 Days
Federal law sets an outer boundary. Under the Speedy Trial Act, trial must begin within 70 days of the indictment being filed or the defendant’s first court appearance, whichever comes later.3Office of the Law Revision Counsel. 18 USC 3161 – Time Limits and Exclusions Trial also cannot start sooner than 30 days after the defendant first appears with counsel, to make sure the defense has time to prepare.
In practice, the clock is far more flexible than the number suggests. The statute excludes long stretches from the count: any delay caused by pretrial motions (from filing through the hearing’s conclusion), mental competency examinations, interlocutory appeals, and continuances the judge grants. A judge can grant an “ends of justice” continuance when the case is unusually complex, when the defense needs more preparation time, or when forcing the trial forward would cause a miscarriage of justice. The judge must state the reasons on the record.3Office of the Law Revision Counsel. 18 USC 3161 – Time Limits and Exclusions Between motion practice, discovery disputes, and agreed continuances, it is common for actual elapsed time from indictment to trial to run six months, a year, or longer while the speedy trial clock shows only a fraction of that has technically ticked.
If the 70 days do expire without proper exclusions, the charges must be dismissed on the defendant’s motion. The court decides whether the dismissal is with or without prejudice based on the seriousness of the offense and the circumstances of the delay.4Office of the Law Revision Counsel. 18 USC 3162 – Sanctions A defendant who fails to raise the issue before trial or before entering a guilty plea waives the right entirely.
State criminal courts follow their own discovery and speedy trial rules, which vary considerably. The federal structure described here is the one most jurisdictions share in broad outline.
What Has to Be Exchanged, and When
Three separate sets of rules govern what the prosecution turns over, and each has its own timing pattern. Together they shape how discovery actually unfolds.
Rule 16 Material
Federal Rule of Criminal Procedure 16 covers the standard exchange. Upon request, the government must produce the defendant’s statements to law enforcement, prior criminal record, documents and physical objects it plans to use at trial or that are material to the defense, and results of forensic tests and scientific examinations.2Legal Information Institute. Federal Rules of Criminal Procedure Rule 16 – Discovery and Inspection Both sides have a continuing duty to promptly produce new evidence they discover as the case develops, which means Rule 16 discovery can effectively stay open until trial begins.5Justia. Federal Rules of Criminal Procedure Rule 16 – Discovery and Inspection That’s one reason timelines are hard to predict with any precision.
When the defense requests broader categories from the government, that triggers a reciprocal obligation to disclose corresponding evidence the defense plans to introduce at trial. The reciprocal obligation is narrower than the prosecution’s because of the Fifth Amendment, but it still adds a step.
Brady and Giglio Material
The prosecution has to turn over any evidence favorable to the defendant that is material to guilt or punishment, whether the defense asks for it or not, under Brady v. Maryland.6Justia. Brady v. Maryland, 373 US 83 (1963) Giglio v. United States extended that duty to evidence undermining the credibility of government witnesses, including cooperation deals, dishonesty history, or anything else useful on cross-examination.7Justia. Giglio v. United States, 405 US 150 (1972) The duty belongs to the prosecution as an office, not just the attorney at counsel table. If one prosecutor made a promise to a witness, everyone on the case is responsible for disclosing it. Gathering Giglio material from different agencies and investigative units routinely adds weeks to discovery in cases built on cooperator testimony.
Jencks Act Statements
The Jencks Act creates a timing rule that often surprises defendants. Prior written or recorded statements of government witnesses are not subject to discovery or subpoena until after the witness finishes direct examination at trial.8Office of the Law Revision Counsel. 18 USC 3500 – Demands for Production of Statements and Reports of Witnesses At that point the defense can move for production. If the government refuses, the judge must strike the testimony and may declare a mistrial. Many federal prosecutors produce Jencks material before trial as a matter of local practice or courtesy, but they aren’t legally required to. When they don’t, mid-trial production requests can cause delays within the trial itself.
Scheduling Orders and Discovery Disputes
Judges don’t leave the pace to the parties’ goodwill. Early in a federal case, the court issues a scheduling order setting deadlines for initial discovery, expert disclosures, and pretrial motions. A sample order from the Eastern District of Michigan, for instance, requires government and defense counsel to meet within ten days of arraignment to narrow the issues.9United States District Court Eastern District of Michigan. Criminal Trial Notice and Scheduling Order Each federal district has its own local rules, and judges set the specific deadlines based on how complicated the case looks.
When one side thinks the other is holding back, the standard tool is a motion to compel. Filing the motion, briefing it, scheduling a hearing, and waiting for the ruling can easily add a month or two. The disputes that take longest involve competing legal interests: the defense argues the government is sitting on Brady material, and the government argues it is protected by a privilege, such as the interest in shielding a confidential informant. These fights sometimes require the judge to review the disputed material in camera before ruling.
Every motion filed during discovery also pauses the speedy trial clock. From the filing date through the conclusion of the hearing, that time is excluded from the 70-day count. A defense team that files several discovery motions can extend the overall case timeline while stopping the clock that protects it from indefinite delay. That trade-off matters when deciding which fights to pick.
What Happens When Discovery Closes
Once both sides have exchanged what they’re required to produce, the case reaches a turning point. The defense has a full picture of what the government can prove and where the weaknesses are. The prosecution knows what the defense plans to present and which witnesses it will challenge.
This is when most plea negotiations actually resolve. With the evidence on the table, the government may offer a reduced charge or agree not to seek a sentencing enhancement, and the defense can make a realistic assessment of trial risk versus a negotiated outcome.10United States Department of Justice. Justice 101 – Plea Bargaining If no agreement is reached, the close of discovery marks the start of final trial preparation: refining witness lists, preparing exhibits, and building the arguments each side will present to the jury.