Libraries and first ammendment?

Many legal scholars believe that a number of legal cases , in particular Reno v. American Civil Liberties Union , established that the use of content-control software in libraries is a violation of the First Amendment. The Children's Internet Protection Act and the June 2003 case US v. ALA found CIPA not unconstitutional on its face, but left open a future "as-applied" Constitutional challenge. However, the American Library Association maintains its stance that "ALA policy is unchanged: ALA does not recommend the use in libraries of filtering technology that blocks constitutionally protected information."