The short answer
Discovery is the process by which the defense obtains the government's evidence. In federal cases the government must, on request, disclose the defendant's own statements, prior record, documents and objects material to the defense, examination and test results, and expert information — with some categories expressly excluded. State rules differ, sometimes considerably.
Your reading roadmap
01
Why discovery matters more than most stages
Almost every meaningful decision in a criminal case — whether to challenge evidence, whether to negotiate, whether to try the case — depends on knowing what the government actually has. Until discovery arrives, advice is necessarily provisional. That is why a lawyer who declines to predict an outcome early is usually being careful rather than evasive.
02
What the federal rule requires
On a defendant's request, the government must disclose the substance of relevant oral statements made during interrogation along with written or recorded statements; a copy of the defendant's prior criminal record; documents and objects material to preparing the defense, intended for use at trial, or obtained from the defendant; results and reports of physical, mental, or scientific examinations and tests; and written information about expert witnesses including opinions, qualifications, and bases.
03
What the rule does not reach
The federal discovery rule expressly excludes internal government documents made by an attorney for the government in connection with investigating or prosecuting the case, and statements made by prospective government witnesses except as another statute provides. Separate legal obligations govern disclosure of information favorable to the defense — a different body of law from the discovery rule itself, and one worth asking counsel about directly.
04
Requesting discovery has a cost
Under the federal rule, a defendant who requests disclosure takes on reciprocal obligations to permit the government access to certain documents, examination results, and expert information the defense intends to use at trial. This is a strategic decision made by counsel, not a formality, and it is one reason discovery is not simply requested reflexively in every case.
05
State rules are their own system
Most criminal cases are state prosecutions, and state discovery rules range from relatively open to comparatively narrow, with different timing and different categories. Some states require reciprocal disclosure more broadly; some provide more; some run on a schedule set by the court. Ask what applies in the specific court handling your case rather than reasoning from the federal rule.
06
How to be useful when discovery arrives
This is the stage where a defendant can genuinely contribute. Read what was produced, carefully and completely, and write down what is wrong, missing, or out of sequence — with specifics rather than characterizations.
- Note factual errors with the page or timestamp where they appear
- Flag anything attributed to you that you did not say
- Identify people present who do not appear in any report
- Note video or records referenced but not produced
- List questions the material raises, in writing, for your lawyer
- Do not discuss the contents outside your defense team
07
Handle the material carefully
Discovery can be subject to protective orders limiting who may see it and what may be done with it, and it frequently contains other people's personal information. Sharing it, posting any part of it, or discussing details with people outside the defense team can create real problems, including new legal exposure. Ask your lawyer what the rules are for your case.
FAQ
Frequently asked questions
Why is discovery taking so long?
Volume and timing rules explain most of it — body-worn video, phone extractions, and lab results arrive on their own schedules, and rules govern when disclosure is required. Delay is common and is not by itself evidence that anything is being withheld, though persistent gaps are a reasonable thing to ask your lawyer about directly.
Am I entitled to everything the police have?
No. The federal rule sets defined categories and expressly excludes some material, including government attorney work product and, in general, prospective government witness statements. Separate obligations govern favorable information. What you are entitled to in a state case is set by that state's rules, so ask specifically.
Can I get a copy of my discovery to keep?
It depends on the jurisdiction, the case, and any protective order, and practices vary between defense offices as well. Ask your lawyer what you may keep, what you may only review with them, and what the restrictions are. Assuming you may share material and being wrong is a costly mistake.
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Know what to gather before you act.
Lawyer in Town publishes general legal information for consumers. It is not legal advice, it does not create an attorney-client relationship, and it cannot account for the facts of any individual situation. Laws, court procedures, filing deadlines, and outcomes differ by state and by court, and they change over time. Confirm anything that affects a decision with a lawyer licensed in the relevant jurisdiction.
Disclosure obligations described here are federal, from Federal Rule of Criminal Procedure 16. State discovery rules differ in scope, timing, and reciprocity. Constitutional disclosure obligations concerning favorable information are a separate body of law and are referenced rather than described.