Bill of Particulars

A bill of particulars is a procedural device used in common-law jurisdictions that requires one party—usually the prosecution in a criminal case or the plaintiff in a civil case—to set out, with greater precision, the specific facts that support a charge or claim already contained in an indictment, information, or complaint. Its purpose is not to add new charges but to clarify existing ones so the responding party can prepare a defense, avoid surprise at trial, and plead double jeopardy if later re-prosecuted for the same conduct.

In United States federal criminal practice, the device is governed by Rule 7(f) of the Federal Rules of Criminal Procedure, which permits a defendant to move for a bill of particulars before or within 14 days after arraignment (subject to the court's discretion). The leading interpretive case, Wong Tai v. United States, 273 U.S. 77 (1927), confirmed that granting a bill lies within the trial court's discretion. Courts generally deny the motion when the indictment is already detailed or when the government has provided extensive discovery.

In civil practice, the bill of particulars survives prominently in New York state procedure under CPLR Article 3041, where it functions as an amplification of pleadings rather than discovery. Most U.S. federal civil courts abolished it with the adoption of the Federal Rules of Civil Procedure in 1938, folding its function into modern discovery tools like interrogatories.

The mechanism also appears in English, Canadian, Australian, and Indian procedure, though terminology and triggers vary. It is conceptually distinct from:

• Discovery, which seeks evidence rather than clarification of pleadings;
• A motion to dismiss, which challenges legal sufficiency;
• An amended indictment, which alters the substance of charges.

For researchers comparing adversarial systems, the bill of particulars illustrates how common-law jurisdictions balance notice pleading against a defendant's right to know the case against them.