CDA

Whoever in interstate or foreign communications ... knowingly
uses any interactive computer service to display in a manner available
to a person under 18 years of age, any comment, request suggestion,
proposal, image, or other communication that, in context, depicts
or describes, in terms patently offensive as measured by contemporary
community standards, sexual or excretory activities or organs,
regardless of whether the user of such service placed the call
or initiated the communication; ... shall be fined under title
18, United States Code, or imprisoned not more than two years,
or both. 

McCain and Coats, 1998

(l) Implementation of a Filtering or Blocking System-

   (1) IN GENERAL- No services may be provided under subsection
       (h)(1)(B) to any elementary or secondary school, or any
       library, unless it provides the certification required by
       paragraph (2) or (3), respectively.

   (2) CERTIFICATION FOR SCHOOLS- Before receiving universal service
       assistance under subsection (h)(1)(B), an elementary or
       secondary school (or the school board or other authority with
       responsibility for administration of that school) shall certify
       to the Commission that it has--    
       (A) selected a system for computers with Internet access to
           filter or block matter deemed to be inappropriate for
           minors; and 
       (B) installed, or will install as soon as it obtains computers
           with Internet access, a system to filter or block such
           matter.

(3) CERTIFICATION FOR LIBRARIES- Before receiving universal service
assistance under subsection (h)(1)(B), a library that has a computer
with Internet access shall certify to the Commission that, on one or
more of its computers with Internet access, it employs a system to
filter or block matter deemed to be inappropriate for minors. If a
library that makes a certification under this paragraph changes the
system it employs or ceases to employ any such system, it shall notify
the Commission within 10 days after implementing the change or ceasing
to employ the system.

(4) LOCAL DETERMINATION OF CONTENT- For purposes of paragraphs (2) and
(3), the determination of what matter is inappropriate for minors
shall be made by the school, school board, library or other authority
responsible for making the required certification. No agency or
instrumentality of the United States Government may--
   (A) establish criteria for making that determination;
   (B) review the determination made by the certifying school, school
       board, library, or other authority; or 
   (C) consider the criteria employed by the certifying school, school
       board, library, or other authority in the administration of
       subsection (h)(1)(B).