The following precursors of controlled substances are "precursor substances":
The state Board of Pharmacy may adopt rules under chapter 14 that add a substance to the list in subdivision 1, if the substance is a precursor to a controlled substance, or delete a substance from the list. A rule adding or deleting a substance is effective only until December 31 of the year following the calendar year during which the rule was adopted.
Minn. Stat. § 152.0972
1990 c 565 s 23; 1993 c 326 art 3 s 7