Whether the First Amendment requires a subjective mental-state showing in a prosecution for true threats of violence.
Holding
Yes. The State must prove that the defendant had some subjective understanding of the threatening nature of the communication; an entirely objective reasonable-person standard is insufficient.
Reasoning
True threats are a historically unprotected category of speech. They are serious expressions conveying an intent to commit unlawful violence, and their harmful effects arise from what the words objectively communicate to their recipient: fear, disruption, and the possibility that violence will occur. But the fact that true threats are generally unprotected does not end the First Amendment inquiry.
The Court reasoned that an objective liability rule risks chilling protected speech. Speakers may avoid forceful, emotional, joking, hyperbolic, or otherwise ambiguous speech because they fear that a listener, prosecutor, or jury will mistakenly classify it as a threat. Requiring proof of a culpable mental state gives protected speech needed breathing room by reducing the danger that a speaker will be punished for an inadvertent misunderstanding.
The Court drew support from its treatment of other unprotected-speech categories. Defamation law protects some false speech through an actual-malice requirement; incitement requires intent to produce imminent lawless action; and obscenity doctrine requires scienter concerning the character and nature of distributed material. Those rules show that the First Amendment can require a subjective element even when the underlying speech category is ordinarily unprotected.