Measurements.

For purposes of measurements under this chapter , the weight of a taxable substance shall be measured by its weight in metric grams in the dealer’s possession. If a taxable substance consists of a mixture containing both marijuana and another substance or combination of substances listed in the definition of taxable substance in section 453B.1 , the taxable substance shall be taxed under section 453B.7, subsection 2 . 90 Acts, ch 1251, §40 C91, §421A.4 C93, §453B.4