(1)  In this Act –

trafficable quantity , of a controlled substance, means –

(a) in the case of a controlled drug that is not mixed with or contained in any other substance, a quantity of the controlled drug that is not less than the quantity specified in column 3 of the table in Part 2 of Schedule 1 in relation to the controlled drug; and

(b) in the case of a controlled drug that is mixed with or contained in another substance where the combined quantity of the substances is not less than the quantity specified in column 3 of the table in Part 2 of Schedule 1 in relation to the controlled drug, any quantity; and

(c) in the case of a controlled plant, a quantity of the controlled plant that is not less than the quantity specified in column 3 of the table in Part 3 of Schedule 1 in relation to the controlled plant; and

(d) in the case of a controlled precursor, a quantity of the controlled precursor that is not less than the quantity specified in column 3 of the table in Part 4 of Schedule 1 in relation to the controlled precursor; and

(e) in the case of 2 or more controlled substances together, an aggregated trafficable quantity of the controlled substances.

(2)  To determine, for the purpose of this Act, whether a quantity of 2 or more controlled substances together constitutes an aggregated trafficable quantity –

(a) the quantity of each of the controlled substances is to be calculated as a fraction of the trafficable quantity of that controlled substance; and

(b) the fractions calculated under paragraph (a) are to be added together; and

(c) the quantity is to be taken to constitute an aggregated trafficable quantity if the total of those fractions so added together is equal to or greater than the number "1" .