Although the U.S.Supreme Court's definition of obscenity has continued to change over time, the document that has prevented the Court from ever fully prohibiting the production and distribution of obscene materials is the:

Question

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The 1st Amendment to the U.S. Constitution, which guarantees freedoms concerning religion, expression, assembly, and the right to petition, has been interpreted to protect the production and distribution of obscene materials to some extent, preventing the Supreme Court from fully prohibiting them.