In addition to the persons authorised by section 48 of the Act to possess narcotic substances, a person who is –

(a) an authorised officer of a medical institution; or

(b) a registered nurse in charge of a ward in a medical institution; or

(c) an authorised nurse; or

(d) an ambulance officer, paramedic or interstate ambulance officer –

may possess and use any narcotic substances for the purposes of his or her profession or employment.