For the purposes of this chapter, unless the context otherwise requires, "controlled drug or substance" means a drug, substance, or immediate precursor in Schedules I through IV of §§ 34-20B-11 to 34-20B-26 , inclusive. Source: SL 1970, ch 229 , § 6 (e); SDL Supp, § 39-17-46; SL 1976, ch 158 , § 42-10 .