As used in this chapter, “practitioner” means: (1) A physician, dentist, veterinarian, podiatrist, optometrist, physician assistant licensed pursuant to § 20-12b, advanced practice registered nurse as defined in subsection (b) of § 20-87a, nurse-midwife, scientific investigator or other person licensed, registered or otherwise permitted to distribute, dispense, conduct research with respect to or to administer a controlled substance in the course of professional practice or research in this state; (2) a hospital or other institution licensed, registered or otherwise permitted to distribute, dispense, conduct research with respect to or to administer a controlled substance in the course of professional practice or research in this state.