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(1) Subject to Subsections (2) and (3), custom is adopted, and shall be applied and enforced, as part of the underlying law.
(2) Subsection (1) does not apply in respect of any custom that is, and to the extent that it is, inconsistent with a Constitutional Law or a statute, or repugnant to the general principles of humanity.
… (Schedule 2.1)

(1) This Constitution and the Organic Laws are the Supreme Law of Papua New Guinea, and, subject to Section 10 (construction of written laws) all acts (whether legislative, executive or judicial) that are inconsistent with them are, to the extent of the inconsistency, invalid and ineffective.
(2) The provisions of this Constitution and of the Organic Laws are self-executing to the fullest extent that their respective natures and subject-matters permit. (Sec. 11)

WE HEREBY DECLARE that all persons in our country have the following basic obligations to themselves and their descendants, to each other, and to the Nation:-
(a) to respect, and to act in the spirit of, this Constitution;
... (Preamble, Basic Social Obligations)

…
(3) For the purposes of determining whether or not any law, matter or thing is reasonably justified in a democratic society that has a proper regard for the rights and dignity of mankind, a court may have regard to-
(a) the provisions of this Constitution generally, and especially the National Goals and Directive Principles and the Basic Social Obligations; and
(b) the Charter of the United Nations; and
(c) the Universal Declaration of Human Rights and any other declaration, recommendation or decision of the General Assembly of the United Nations concerning human rights and fundamental freedoms; and
(d) the European Convention for the Protection of Human Rights and Fundamental Freedoms and the Protocols thereto, and any other international conventions, agreements or declarations concerning human rights and fundamental freedoms; and
(e) judgements, reports and opinions of the International Court of Justice, the European Commission of Human Rights, the European Court of Human Rights and other international courts and tribunals dealing with human rights and fundamental freedoms; and
(f) previous laws, practices and judicial decisions and opinions in the country; and
(g) laws, practices and judicial decisions and opinions in other countries; and
(h) the Final Report of the pre-Independence Constitutional Planning Committee dated 13 August 1974 and presented to the pre-Independence House of Assembly on 16 August 1974, as affected by decisions of that House on the report and by decisions of the Constituent Assembly on the draft of this Constitution; and
(i) declarations by the International Commission of Jurists and other similar organizations; and
(j) any other material that the court considers relevant. (Sec. 39)

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(7) Notwithstanding the consent of Papua New Guinea to be bound as a party to a treaty, no treaty forms part of the municipal law of Papua New Guinea unless, and then only to the extent that, it is given the status of municipal law by or under a Constitutional Law or an Act of the Parliament.
… (Sec. 117)

(1) Subject to Subsection (4), the Supreme Court shall, on application by an authority referred to in Subsection (3), give its opinion on any question relating to the interpretation or application of any provision of a Constitutional Law, including (but without limiting the generality of that expression)any question as to the validity of a law or proposed law.
…
(3) The following authorities only are entitled to make application under Subsection (1):-
(a) the Parliament; and
(b) the Head of State, acting with, and in accordance with, the advice of the National Executive Council; and
(c) the Law Officers of Papua New Guinea; and
(d) the Law Reform Commission; and
(e) the Ombudsman Commission; and
(ea) a Provincial Assembly or a Local-level Government; and
(eb) a provincial executive; and
(ec) a body established by a Constitutional Law or an Act of the Parliament specifically for the settlement of disputes between the National Government and Provincial Governments or Local-level Governments, or between Provincial Governments, or between Provincial Governments and Local-level Governments, or Local-level Governments; and
(f) the Speaker, in accordance with Section 137(3) (Acts of Indemnity).
(4) Subject to any Act of the Parliament, the Rules of Court of the Supreme Court may make provision in respect of matters relating to the jurisdiction of the Supreme Court under this section, and in particular as to-
(a) the form and contents of questions to be decided by the Court; and
(b) the provision of counsel adequate to enable full argument before the Court of any question; and
(c) cases and circumstances in which the Court may decline to give an opinion.
… (Sec. 19)

(1) Subject to this Constitution, the Supreme Court has original jurisdiction, to the exclusion of other courts, as to any question relating to the interpretation or application of any provision of a Constitutional Law.
(2) Subject to this Constitution, where any question relating to the interpretation or application of any provision of a Constitutional Law arises in any court or tribunal, other than the Supreme Court, the court or tribunal shall, unless the question is trivial, vexatious or irrelevant, refer the matter to the Supreme Court, and take whatever other action (including the adjournment of proceedings) is appropriate. (Sec. 18)

(1) Notwithstanding anything to the contrary in any other provision of any law, any act that is done under a valid law but in the particular case-
(a) is harsh or oppressive; or
(b) is not warranted by, or is disproportionate to, the requirements of the particular circumstances or of the particular case; or
(c) is otherwise not, in the particular circumstances, reasonably justifiable in a democratic society having a proper regard for the rights and dignity of mankind, is an unlawful act.
… (Sec. 41)

Subject to this Constitution, each provision of this Division applies, as far as may be-
(a) as between individuals as well as between governmental bodies and individuals; and
(b) to and in relation to corporations and associations (other than governmental bodies) in the same way as it applies to and in relation to individuals, except where, or to the extent that, the contrary intention appears in this Constitution. (Sec. 34)

WE HEREBY ACKNOWLEDGE that, subject to any restrictions imposed by law on noncitizens, all persons in our country are entitled to the fundamental rights and freedoms of the individual, that is to say, the right, whatever their race, tribe, places of origin, political opinion, colour, creed or sex, but subject to respect for the rights and freedoms of others and for the legitimate public interest,
… (Preamble, Basic Rights)