What court declares the final word on the constitutionality of the law?
This would depend on which constitution you speak of. If it is
of the specific state's Constitution, then the highest court of
that state (typically known as a Supreme Court). If it is of the US
Constitution, then the final word is of the US Court. For example,
in Roe v. Wade the Supreme Court decided that a Texas law against
abortion violated the 14th Amendment. This would depend on which
constitution you speak of. If it is of the specific state's
Constitution, then the highest court of that state (typically known
as a Supreme Court). If it is of the US Constitution, then the
final word is of the US Supreme Court. For example, in Roe v. Wade
the Supreme Court decided that a Texas law against abortion
violated the 14th Amendment.