In American jurisprudence, the overbreadth doctrine is primarily concerned with facial challenges to laws under the First Amendment. American courts have recognized several exceptions to the speech protected by the First Amendment (for example, obscenity and fighting words), and states therefore have some latitude to regulate unprotected speech. A statute doing so is overly broad (hence, overbreadth) if, in proscribing unprotected speech, it also proscribes protected speech. Overbreadth is closely related to vagueness; if a prohibition is expressed in a way that is too unclear for a person to reasonably know whether or not their conduct falls within the law, then to avoid the risk of legal consequences they often stay far away from anything that could possibly fit the uncertain wording of the law. The law's effects are thereby far broader than intended or than the Constitution permits, and hence the law is overbroad.
Lewis Sargentich first analyzed and named the doctrine in his famous note in the Harvard Law Review, The First Amendment Overbreadth Doctrine (83 Harv. L. Rev. 844). Then, citing Sargentich's note, the Supreme Court in Broadrick v. Oklahoma explicitly recognized the doctrine in 1973.
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