Laying of rules and notifications before Parliament requires parliamentary review and permits modification or annulment by both Houses. Rules, regulations and specified notifications and orders under the Customs Act must be laid before each House of Parliament while in session for a cumulative period of thirty days, except for orders concerning goods of a strategic, secret, individual or personal nature. If, before the expiry of the following session, both Houses agree to modify or annul the instrument, it will thereafter take effect only as modified or be of no effect; such modification or annulment does not affect the validity of actions previously taken under that instrument.