4COffences under 2 or more laws

4C  Offences under 2 or more laws  (1) Where an act or omission constitutes an offence:  (a) under 2 or more laws of the Commonwealth; or  (b) both under a law of the Commonwealth and at common law; the offender shall, unless the contrary intention appears, be liable to be prosecuted and punished under either or any of those laws of the Commonwealth or at common law, but shall not be liable to be punished twice for the same act or omission.  (2) Where an act or omission constitutes an offence under both:  (a) a law of the Commonwealth and a law of a State; or  (b) a law of the Commonwealth and a law of a Territory; and the offender has been punished for that offence under the law of the State or the law of the Territory, as the case may be, the offender shall not be liable to be punished for the offence under the law of the Commonwealth.  (3) Where an act or omission constitutes an offence against a law of a Territory, the validity of that law is not affected merely because the act or omission also constitutes an offence against a law of the Commonwealth.