setting a presumption of supply. Section 6(6) of the act creates a presumption that when a person is found in possession of a quantity of a controlled drug equivalent to (or exceeding) the amount specified in the act's schedules, they possess the drug for the purpose of supplying it to others. The legal burden of proof then shifts to the defendant to prove that he or she did not possess the drug for purposes of supply and it was intended for personal use. This reverse onus clause is controversial because of its inconsistency with the New Zealand Bill of Rights Act 1990, which stipulates that every person is presumed innocent until proven guilty. Several problems with the act have emerged during the 30 years since its enactment, and it is uncertain whether it now provides a coherent, effective legislative framework. It has been questioned whether the statutory presumption of possession for supply should continue to apply after the Supreme Court's decision in R v Hansen. Application Current thresholds The presumption of supply thresholds are set out in Schedule 5 of the Misuse of Drugs Act 1975. , the thresholds are as follows: Bill of Rights Act 1990 The New Zealand Bill of Rights Act 1990 sets out the rights and freedoms of anyone subject to New Zealand law, and is part of the country's uncodified constitution. The act protects fundamental rights and freedoms in New Zealand society in a general, rather than absolute, sense. When an act is prima facie inconsistent with a right or freedom contained in the Bill of Rights, the starting point for that act's application is to examine that meaning against the guaranteed right to see if the right is curtailed. If so, the Bill of Rights' interpretive provisions (sections 4, 5 and 6) are engaged. Presumption of innocence: Section 25(c) Section 25(c) of the Bill of Rights Act 1990 affirms the right of anyone charged with an offence to be presumed innocent until proven guilty according to law. It establishes that the burden of proof of guilt in criminal cases is carried by the prosecutor, who must prove the accused's guilt beyond reasonable doubt. It is widely-acknowledged common law that the prosecution must prove guilt even when an affirmative defence is argued. A provision requiring an accused person to disprove the existence of a presumed fact, that fact being an important element of the offence