在学校里,学生有多少自由言论

这个先例很清楚:

In Bethel, the Court upheld the right of Washington state high school administrators to discipline a student for delivering a campaign speech at a school assembly that was loaded with sexual innuendo.  The Court expressed the view that administrators ought to have the discretion to punish student speech that violates school rules and has the tendency to interfere with legitimate educational and disciplinary objectives.  In Hazelwood, the Court relied heavily on Bethel to uphold the right of school administrators to censor materials in a student-edited school paper that concerned sensitive subjects such as student pregnancy, or that could be considered an invasion of privacy.