(1) This section applies to offences under any of the following provisions of this Act, that is to say, sections 6(2), 6(3), 8(2), 8(3), 9(2) and 19.
(2) Subject to subsection (3), in any proceedings for an offence to which this section applies it shall be a defence for the person charged to prove that he or she neither knew of nor suspected nor had reason to suspect the existence of some fact alleged by the prosecution which it is necessary for the prosecution to prove if he or she is to be convicted of the offence charged.
(3) Where in any proceedings for an offence to which this section applies it is necessary if the accused is to be convicted of the offence charged, for the prosecution to prove that some substance or product involved in the alleged offence was the controlled drug which the prosecution alleges it to have been, and it is proved that the substance or product in question was that controlled drug, the accused—
(a) shall not be acquitted of the offence charged by reason, only of proving that he or she neither knew, nor suspected nor had reason to suspect that the substance or product in question was the particular controlled drug alleged; but
(b) shall be acquitted thereof—
(i) if he or she proves that he or she neither believed nor suspected nor had reason to suspect that the substance or product in question was a controlled drug, or
(ii) if he or she proves that he or she believed the substance or product in question to be a controlled drug, or a controlled drug of a description, such that if it had in fact been that controlled drug or a controlled drug of that description he or she would not at the material time have been committing any offence to which this section applies.
(4) This section shall not prejudice any defence which it is open to a person charged with an offence to which this section applies to raise apart from this section.