Parliamentary scrutiny of delegated customs instruments: specified rules and notifications must be laid for review and may be modified or annulled. Section 159 mandates that rules, regulations, notifications and specified orders under the Customs Act be laid before both Houses of Parliament for a review period spanning one or more sessions; if both Houses subsequently agree to modify or annul an instrument within the immediately following session(s), the instrument will operate only as modified or be of no effect, while actions previously taken under the instrument remain valid. Excluded are orders relating to goods of a strategic, secret, individual or personal nature.