Question

What happens when supreme court declares a law unconstitutional?

Answer 1

The law becomes null and void which means it's no longer enforced by the court and law enforcement officials.

Answer 2

When Supreme Court declares a law unconstitutional, the law gets void and null and it would not be enforced no longer by the Supreme Court and the officials related to the law enforcement.

If the law continues going to Supreme Court and the court declares it unconstitutional, then courts under it must fall.