Section 19B 1/2. Notwithstanding any special or general law to the contrary, a municipality or non-municipal public agency that is duly registered pursuant to subsection (g) of section 7 may convey or exchange naloxone or another opioid antagonist approved by the department to or with another duly registered entity to ensure the availability and use of unexpired naloxone or other approved opioid antagonist; provided, however, that such an exchange shall be recorded in a memorandum between the registered entities in a manner prescribed by the department.