Discovery

Discovery is the process where both sides in a criminal case have to share their evidence with each other before trial. Police reports, witness statements, lab results, body camera footage, photographs, and 911 recordings — all of it gets exchanged so that no one walks into trial blind. In California, discovery is governed by detailed rules, and what gets turned over (and when) often shapes the entire defense.

How Discovery Works in California

California criminal discovery is governed primarily by Penal Code §§ 1054 through 1054.7, often called the reciprocal discovery statute. Under § 1054.1, the prosecution must turn over all material it intends to use at trial, including witness names and statements, reports of experts, real evidence, prior records of witnesses, and any exculpatory material. Under § 1054.3, the defense must reciprocally disclose witnesses it intends to call and reports of any defense experts. Discovery is generally due 30 days before trial, with continuing obligations to update.

On top of California’s statutes, the prosecution has constitutional duties under Brady v. Maryland to disclose evidence favorable to the accused — whether or not the defense asks. This includes evidence that could lead to acquittal, reduce a sentence, or impeach a key witness. The companion duty under Giglio v. United States covers impeachment material about prosecution witnesses, including police officers. California also enforces these obligations through People v. Superior Court (Johnson) and Pitchess motions, which let the defense access law enforcement personnel records when officer credibility is at issue.

Pitchess motions, codified in Evidence Code §§ 1043 through 1047 and Penal Code § 832.7, are uniquely important in California. They allow the defense to seek discovery of officer misconduct records — prior complaints, sustained findings, and similar material — when there is good cause to believe the officer’s conduct or credibility is in dispute. Following the passage of SB 1421 and SB 16, even more police records have become directly accessible, dramatically reshaping what defense attorneys can obtain in California criminal cases.

Discovery also extends to electronic and forensic material. Body-worn camera footage, dash cam video, lab notes, calibration records for breath testing devices, dispatch recordings, and DNA profiling raw data all fall within discovery obligations. When prosecutors fail to disclose these items in a timely way, California courts can impose sanctions ranging from continuances to jury instructions, witness exclusion, or — in the most serious cases — dismissal.

Why Discovery Matters to Your Defense

Discovery is where most California criminal cases are actually decided. The strongest defenses are not pulled from thin air — they come from carefully reviewing every document, every video frame, every lab note, and every witness statement that the prosecution has. A criminal defense attorney who treats discovery seriously can find the inconsistency in a police report, the gap in a chain of custody, the missing piece of body cam footage, or the prior complaint against the arresting officer that changes everything.

The Brady duty deserves special attention. Prosecutors are required to disclose exculpatory and impeachment evidence, but they do not always identify it as such. Defense lawyers who file specific, targeted Brady demands — and who follow up with motions to compel — regularly uncover material that shifts the balance of the case. In serious felony matters, Brady violations have been the basis for reversed convictions in California year after year.

Discovery also drives plea negotiations. The same evidence that creates leverage in a courtroom creates leverage at the bargaining table. When the defense knows the case better than the prosecutor — when it has spotted the suppression issue, the credibility problem, the chain of custody gap — plea offers improve. The work of discovery, done thoroughly, is one of the most undervalued and most consequential parts of California criminal defense.

Related Legal Terms

Discovery is the engine that powers later motions, including the suppression motion, motion in limine, and pretrial motions practice. It is closely tied to concepts like exculpatory evidence, chain of custody, and expert witness preparation — central to our DUI defense, drug crimes defense, and broader criminal defense work.

Facing Charges Where This Applies?

If your case is moving forward, the work being done in discovery right now is shaping every outcome that follows. Attorney Chris Nalchadjian offers free, confidential consultations 24/7 to make sure no piece of evidence in your case goes unexamined. Call KN Law Firm at (888) 950-0011.