(1) For the purposes of this Part, a substance is used as a "drug-cutting agent" if it is added to a controlled drug in connection with the unlawful supply or exportation of the drug

(2) In this Part -

"controlled drug" has the same meaning as in the Misuse of Drugs Act 1971 (see section 2 of that Act);

"enactment" includes - (a) an enactment contained in subordinate legislation within the meaning of the Interpretation Act 1978; (b) an enactment contained in, or in an instrument made under, an Act of the Scottish Parliament; (c) an enactment contained in, or in an instrument made under, Northern Ireland legislation;

"entitled", in relation to a substance, is to be read in accordance with subsection (3);

"police or customs officer" has the meaning given by section 52(2);