N.Y. Pub. Health Law § 3301

§ 3301. Applicability of this article to actions and matters occurring\nor arising before and after the effective date. Unless otherwise\nexpressly provided, or unless the context otherwise requires:\n (a) the provisions of this article shall govern and control the\npossession, manufacture, dispensing, administering, and distribution of\ncontrolled substances with respect to any matter, act or omission,\narising or occurring on or after the effective date hereof;\n (b) the provisions of this article do not apply to or govern any\nmatter, act, or omission arising or occurring prior to the effective\ndate hereof. Such matters, acts, or omissions must be governed and\nconstrued according to provisions of law existing at the time such\nmatter, act or omission arose or occurred in the same manner as if this\narticle had not been enacted.\n