We shouldn't have to ban books, because technically they should never be there in the first place. Any place (schools, library, etc.) or person that distributes this material to children is breaking the law.
18 U.S. Code § 1470 - Transfer of obscene material to minors
Whoever, using the mail or any facility or means of interstate or foreign commerce, knowingly transfers obscene matter to another individual who has not attained the age of 16 years, knowing that such other individual has not attained the age of 16 years, or attempts to do so, shall be fined under this title, imprisoned not more than 10 years, or both.
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