The Secretary of the Department of Health shall place a substance in Schedule VI if he or she finds that:
(1) The substance is not currently accepted for medical use in treatment in the United States;
(2) There is lack of accepted safety for use of the drug or other substance even under direct medical supervision;
(3) The substance has relatively high psychological or physiological dependence liability, or both; and
(4) Use of the substance presents a definite risk to public health.