Content based refers to a law or regulation that discriminates against expression based on the substance of what it communicates. In contrast, a content-neutral law applies to expression without regard to its substance. The Supreme Court is likely to strike down regulations that discriminate on the basis of what is said or expressed.

Designation of a law as either content based or content neutral is an important first step in ascertaining whether it violates the First Amendment. Content-based laws are presumptively unconstitutional and subject to strict scrutiny, the highest form of judicial review, whereas content-neutral laws generally must survive only intermediate scrutiny. Examples of laws that the Supreme Court has designated as impermissibly content based include a statute criminalizing indecent phone messages, determined in Sable Communications of California v. Federal Communications Commission (1989); a law imposing financial burdens on literary works by former felons mentioning past crimes, in Simon and Schuster v. Members of the New York State Crime Victims Board (1991); and a District of Columbia law prohibiting the display of signs critical of foreign governments within a certain distance outside embassies, in Boos v. Barry (1988).

Viewpoint discrimination occurs when a governmental regulation restricts expression based not only on its content, but specifically on the underlying views in the message. Content-based restrictions limit speech based on its subject matter, while viewpoint-based restrictions limit speech based on ideology and perspective. A law banning all political speeches in a public park would be content based; a law banning only political speeches by members of the Socialist Party would be viewpoint based. In the words of Justice Anthony M. Kennedy in Rosenberger v. Rector and Visitors of the University of Virginia (1995), “Viewpoint discrimination is thus an egregious form of content discrimination.”

Some language from Court opinions indicates that content-based laws are flatly unconstitutional. In Police Department of Chicago v. Mosley (1972), Justice Thurgood Marshall wrote for the Court that “the First Amendment means that government has no power to restrict expression because of its message, its ideas, its subject matter, or its content.” In reality, the Court’s case law establishes that content-based laws can be constitutional if they survive strict scrutiny. For example, the Court in Burson v. Freeman (1992) upheld a law in Tennessee prohibiting the display of campaign materials within 100 feet of a polling place. The Court also employs a categorization analysis providing that certain, narrow categories of expression — such as obscenity, child pornography, true threats, and incitement to imminent law-less action — can be prohibited precisely because of their harmful content. The content-discrimination model remains a vital tool in First Amendment analysis. In the words of Justice Sandra Day O’Connor in City of Ladue v. Gilleo (1994), “no better alternative has yet come to light.”

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