(1A) It is
a defence to a charge of an offence against subsection (1) for a person to
prove that the person has a reasonable excuse for possessing the
relevant substance or thing.
(2) In this section—
"relevant substance or thing" means—
(a) a substance that is, or contains, a
controlled substance and the gross weight of the relevant substance is of, or
exceeds, the gross weight specified in the Drugs Misuse Regulation 1987,
schedule 8A in respect of the relevant substance; or
(b) substances that
together are, or contain, a controlled substance and the total gross weight of
the relevant substances is of, or exceeds, the total of the gross weights
specified in the Drugs Misuse Regulation 1987, schedule 8A in respect of the
relevant substances; or
