From the Comic Book Legal Defense Fund:
Three similar bills recently introduced in the Minnesota legislature would require school districts to notify parents or guardians every time a fellow parent, guardian, or an adult student deems instructional material such as books or movies to be “sexually explicit or obscene and therefore harmful to minors.” Although the bills do not require discontinuing use of the disputed material, the most extreme version would force districts to publicly justify its retention in the curriculum. To make matters worse, all three bills would apparently allow complainants to remain anonymous.
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As we have seen recently in Kansas and Ohio, “harmful to minors” is actually a legal term which many states have enshrined in statute.