The u. s. supreme court in schenck v. u. s. (1919) articulated a test to draw the line between protected and unprotected speech in order to see "whether the words used" could create a "clear and present danger that they will bring about substantive evils that congress sees to prevent." this test is known as the

This test is known as a Clear and present danger test

Explanation: The Clear and Present Danger test was adopted by the US supreme court in 1919 to establish the limitations to "free speech".

This test was established to clearly define the content of free speech and the effects it may cause. It was used to establish whether a statement can cause a harm.

the longest time is 123 years