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A teacher could not instruct students in how to build explosives for use in Federal crimes:
It shall be unlawful for any person to teach or demonstrate the making or use of an explosive, a destructive device, or a weapon of mass destruction [...] with the intent that the teaching, demonstration, or information be used for, or in furtherance of, an activity ...
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In 1925 Tennessee passed the Butler Act, which prohibited the teaching of evolution in public schools, more specifically the teaching that "mankind was descended from a lower type". This law was challenged in the famous Scopes Trial, more formally The State of Tennessee v. John Thomas Scopes, often known as the 'Monkey Trial".
Scopes was ...
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Just from recent news I know that Critical Race Theory
Critical race theory (CRT) is a body of legal scholarship and an academic movement of US civil-rights scholars and activists who seek to critically examine the intersection of race and U.S. law and to challenge mainstream American liberal approaches to racial justice.12[4] CRT examines social, cultural,...
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The state has wide discretion on what to require that a school teach to children, particularly in the K-12 grade range. There is little case law where a parent or private school has challenged such requirements. However, for a state to forbid that certain things be taught would probably run into a first amendment problem, because the school has free speech ...
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Why would this be a concern?
The adults have some duty in an elementary school setting to monitor the children in the restroom in any case. Separate restrooms are an employee perk, not a liability driven decision.
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