Allow use of expired opioid antagonists

This bill allows schools, individuals, and medical professionals in Montana to use expired opioid overdose reversal medication like naloxone without legal liability. It authorizes schools to stock and administer expired medication to students or others during an overdose emergency, while also permitting individuals who have received prescriptions to possess, store, and use expired doses. The law provides immunity from civil and criminal penalties for schools, employees, eligible recipients, and medical practitioners who act in good faith, except in cases of gross negligence or intentional misconduct. Schools must follow specific protocols for training, storage, and parental notification, and the bill amends existing state statutes to clarify these protections and procedures.