has just been struck down, both on First Amendment grounds and dormant Commerce Clause grounds. I haven’t read the entire opinion, but what I have read suggests that the court’s main reasons were: (1) given existing technical limitations, the law essentially pressures ISPs into blocking a lot of fully protected material as well as the unprotected child pornography; (2) the orders are issued before a full trial on the merits and are thus unconstitutional prior restraints (see the discussion of prior restraint law in this article for more); and (3) the law ended up excessively interfering not just with access to protected material by Pennsylvanians but also with such access by residents of other states, which makes the law an unconstitutional state regulation of interstate commerce (not all such state regulations are unconstitutional, but some are). The opinion is here.
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