Statutes Requiring an Overt Act

Statutes Requiring an Overt Act

The common-law rule that the agreement alone completes the offense survives in some places, but most American conspiracy statutes depart from it by adding a further element. Under the overt-act requirement, at least one conspirator must do some act in furtherance of the plan, a step beyond the agreement itself, before the conspiracy is complete, and a legislature may impose that demand for all conspiracies or only for specified objects.¹ Where no statute provides otherwise, the common-law rule still governs, so the addition is a legislative choice that has to be found in the jurisdiction's enactments.² Whether the agreement alone is enough therefore depends on what the statute says.

A legislature that adds the act is judging that a bare agreement is too thin a basis for prosecution.³ The judgment follows from how agreements are proved. Conspirators seldom sign anything or announce their deal, so the prosecution usually has to persuade a jury that an agreement exists by pointing to conduct, and a plan that has produced no conduct leaves the jury little to rely on.⁴ The overt act fills that gap. It shows that the conspiracy has moved beyond a purely mental state and reached the implementation stage, and it gives the factfinder additional proof that the agreement exists and that the parties are willing to adhere to it.⁵ The act marks the point at which the conspiracy is at work, no longer a project resting only in the conspirators' minds and not yet a finished operation.⁶

Because the act's job is to supply evidence, it can be modest. It may be lawful and innocent in itself, such as renting a van or buying a ladder, and it need not come anywhere near the conduct that would amount to an attempt.⁷ The next section takes up that low threshold in detail.

Whether a given statute carries the requirement is a question of statutory text, and the federal code shows both answers side by side. The general conspiracy statute, 18 U.S.C. § 371, applies when "one or more of such persons do any act to effect the object of the conspiracy."⁸ Its elements accordingly include an overt act alongside the agreement, the unlawful object, and knowledge and intent.⁹ The federal drug conspiracy statute, 21 U.S.C. § 846, says nothing about an overt act. In United States v. Shabani the Supreme Court held that the statute therefore requires none, concluding that Congress's silence indicates an intent to adopt the common-law definition of conspiracy for drug conspiracies.¹⁰

The logic of that reading is straightforward. Congress wrote the act into its general statute, so a later conspiracy statute that omits it is taken as a choice to follow the common-law default, and courts do not supply the missing element by implication.¹¹ Later decisions apply the same approach. In Whitfield v. United States the Court read the silent money laundering provision, 18 U.S.C. § 1956, to require no overt act, relying on the presumption that Congress adopts the common-law meaning of statutory terms absent contrary indications, and the Seventh Circuit reached the same result for Hobbs Act conspiracy in United States v. Jett.¹² RICO conspiracy under 18 U.S.C. § 1962(d) likewise requires no overt act.¹³ The general statute's requirement does not carry over to these later statutes, so knowing that § 371 demands an act supports no assumption about any other federal conspiracy charge.¹⁴

The only variable in that pair is the statutory text, which is why the first step on any conspiracy problem is to read the governing provision. A third pattern ties the requirement to the object of the conspiracy, and the Model Penal Code is the standard example: § 5.03(5) bars a conviction for conspiracy to commit any crime other than a first- or second-degree felony unless an overt act in pursuance of the conspiracy is alleged and proved, whether done by the defendant or by someone the defendant conspired with.¹⁵ That approach receives its own treatment below. A few states also raise the bar by demanding a substantial step rather than any act, a variant the next section covers.¹⁶

In a jurisdiction that imposes the requirement, the offense has one more element to satisfy, so the moment of completion shifts from the agreement to the first act in furtherance. Until that act, the prosecution has no completed conspiracy to charge, and withdrawal before the act is committed takes on significance in these jurisdictions, a point developed later under duration and abandonment.¹⁷ On an exam stem in which the parties agreed but did little else, the question to ask first is what the jurisdiction requires: the common-law rule, a statute demanding an act for all or some objects, or a split like the Model Penal Code's. When the stem names a federal statute, the text decides, and silence points toward the common-law rule.