Final answer:
The registered nurse should contact the state board of nursing to determine the legal scope of practice for LPNs in Arkansas.
Step-by-step explanation:
The correct course of action for the registered nurse (RN) in this situation is to contact the state board of nursing to determine the legal scope of practice for LPNs. The nurse practice act for each state provides guidelines and regulations for the nursing profession, including the scope of practice for different levels of nursing professionals.
While querying the state nursing association or asking the LPNs on the unit for information may be helpful, the most accurate and authoritative source for determining the scope of practice for LPNs is the state board of nursing. California's nurse practice act is specific to that state and may not be applicable in Arkansas, so it would not provide the necessary information in this case.