Section 3328. Exemptions from title

The following persons engaging in the
  following activities shall be exempt from the provisions of this title:
    1. A practitioner lawfully administering, dispensing, or prescribing a
  controlled substance in the course of his professional  practice  to  an
  ultimate user for a recognized medical purpose;
    2. A licensed manufacturer engaged in research upon non-human subjects
  or  chemical  analysis  conducted  on  the  premises  specified  in  the
  manufacturer's license;
    3. A licensed distributor engaged in quality control analysis  at  the
  premises specified in his license.
    4.  A  practitioner  or  patient  participating in a clinical research
  program on the therapeutic use of  marijuana  or  tetrahydrocannabinols.
  (a)  Each  such  clinical  research program shall have received protocol
  approval from the United States  Food  and  Drug  Administration,  shall
  possess an effective investigational new drug application and shall have
  been  registered  by  the Drug Enforcement Administration, United States
  Department of Justice.
    (b)  Each  such  clinical  research  program  authorized   under   the
  provisions of article thirty-three-A of this chapter.