Final answer:
The statement that police cannot restrict free speech under any circumstances due to the First Amendment is false; there are several key restrictions, including laws against incitement, fighting words, genuine threats, and defamation.
Step-by-step explanation:
Police cannot restrict free speech under any circumstance because of the First Amendment to the US Constitution. The statement is False. The First Amendment protects the freedoms of religion, speech, press, assembly, and petition, but this protection is not absolute.
There are several key restrictions, including laws against incitement of a criminal act, "fighting words," genuine threats, and defamation (slander and libel).
For example, speech that creates a clear and present danger is not protected under the First Amendment, as established in the legal precedent set by the Supreme Court in cases like Gitlow v. New York. The Court has to balance the right to free expression with the need to preserve public safety and order.