Concept
Due Process Backstop
Mistake-of-law excuse for belief conduct is not an offense
Due Process Backstop
The Code's defense answers the unfairness of convicting a person who had no idea the conduct was illegal, but it reaches only as far as the categories and conditions the drafters wrote into § 2.04(3).1 The Constitution supplies a second protection that does not wait for any legislature to adopt the Code. Due process can bar a conviction where the state itself assured the defendant that the conduct was lawful, and federal courts call the resulting defense entrapment by estoppel.2 The Massachusetts court in Twitchell drew that connection when it described a Code-style reliance defense. It observed that federal courts treat such a defense as entrapment by estoppel and that the defense rests on fairness principles grounded, in federal criminal cases, in the Due Process Clause of the Fifth Amendment.3 The constitutional rule therefore sits beneath the statutory defense and works as a floor.
The protection follows from the reason for the rule it qualifies. The maxim that ignorance of the law is no excuse exists to encourage people to learn and obey the law, since excusing ignorance would reward those who never looked.4 A person who asks the state what the law requires and acts on the answer has done exactly what the maxim invites, so punishing that person pushes in the opposite direction and lets the government profit from its own misstatement. The speaker is also the same sovereign that defines and prosecutes the offense. That is why these exceptions resemble the void-for-vagueness and ex post facto doctrines: in each, the government, acting through its officials, is responsible for the defendant's inability to know that the conduct was forbidden.5
Two Supreme Court decisions show the principle at work. In Raley v. Ohio, witnesses before a state investigating commission refused to answer questions after the commission told them they could invoke the privilege against self-incrimination. The advice was wrong, because an Ohio statute protected their answers from use in a criminal prosecution and so no privilege existed, and the witnesses were convicted of contempt. The Supreme Court stated that affirming would sanction "the most indefensible sort of entrapment by the State."6 In Cox v. Louisiana, demonstrators were told, in effect, by the highest police officials of the city that they could lawfully meet 101 feet from the courthouse steps, and they were then convicted of parading "near" the courthouse. The Court held that the Constitution forbids that conviction.7 The two cases differ in who spoke and about what. A commission running the very proceeding in which the witnesses stood spoke about a legal privilege, while the city's police leadership spoke about where a demonstration could lawfully take place. What they share is a state actor with evident authority over the matter who said the conduct was permitted, followed by a prosecution that treated the same conduct as criminal.
The constitutional rule does not depend on the Code's machinery. The Code's defense reaches only the four categories of official statement that § 2.04(3)(b) lists, and for interpretations it requires the officer or body charged by law with responsibility for the law defining the offense.8 A constitutional claim does not wait on those categories, so the Code can allow a conviction that the Constitution, standing alone, would forbid.9 A defendant in a jurisdiction that never adopted a Code-style defense may still have the constitutional one.10 That defense carries its own reasonableness requirement, since the defendant's reliance must be deemed reasonable.11 The backstop therefore widens the set of people who can be protected without removing the need to show that trusting the assurance made sense.
The same reasoning supports the criticism of Hopkins v. State. A minister was charged with erecting a sign that solicited marriages, and the trial court refused to hear evidence that he had acted only after the local prosecutor told him his plan was lawful.12 The court rejected the defense on the ground that the prosecutor's advice "would become paramount to the law."13 That objection fails on its own terms. The law would remain paramount, because the advice would give a good-faith defense only to the individual who received it, and only until that individual was authoritatively told otherwise. Convicting a person for conduct that state officials said was permissible would also amount to an indefensible sort of entrapment by the State, which is why the result in Hopkins appears contrary to due process.14
The backstop is triggered by an assurance from the state, and that requirement separates it from the baseline rule that a defendant's own misreading of the law is no defense.
A separate branch of due process protects some defendants who received no notice at all, and it is narrower than the entrapment line. In Lambert v. California, a Los Angeles ordinance made it unlawful for a convicted person to remain in the city more than five days without registering. The Supreme Court held the ordinance violated the notice requirements of due process as applied to a defendant with no actual knowledge of the duty to register, where nothing in the circumstances would prompt an inquiry.15 The holding does not reach a person who is under an obligation to learn the law. A dairy manufacturer, for example, cannot plead ignorance of a regulation on the fat content of butter, because someone engaged in a regulated business has a duty to keep informed about the rules governing it.16 Lambert and entrapment by estoppel are both recognized limits on the no-excuse rule, and each applies only in narrow circumstances.17 Their fuller development belongs to constitutional criminal law, and here they matter as the floor beneath § 2.04(3).
The exam trap runs in two directions. The first is stopping at § 2.04(3) when the stem describes an official assurance. A defendant who fails a Code condition, such as the identity of the official, has not necessarily lost, because the constitutional question still asks whether the state actually told the defendant the conduct was lawful and whether relying on that statement was reasonable. The second error invokes due process for a defendant who simply misread the law or never learned of it, with no assurance from anyone, which leaves the baseline rule intact.