The Supreme Court created a rule in : Students' right to free speech can be curtailed only if it "materially and substantially interferes with the requirements of appropriate discipline in the operation of the school."

Tinker

Explanation:

Tinker is an attempt to improve already existing rule through modifications or restrictions or introduction of a guiding clause.

The supreme court rule rule has a guiding clause (tinker) to curtail student's right to free speech in order not to give room for actions that could interfere with the requirements of the school

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