The statement that is true of a writ of habeas corpus is:
It was suspended by the federal government during the Civil War.
The writ of habeas corpus is a legal action that allows individuals to challenge the legality of their detention or imprisonment. While it is an important legal principle in the U.S. Constitution, it has not been ruled unconstitutional or required by police to inform suspects of their rights. Additionally, it is not the result of a constitutional amendment.