Final answer:
Leak testing for systems containing CFCs, HCFCs, or HFCs should be performed in accordance with government regulations, aligning with the guidelines established by the Montreal Protocol.
Step-by-step explanation:
A person who services a refrigeration/air conditioning system that contains or may have contained a CFC/HCFC/HFC must conduct the leak testing in accordance with government regulations. These compounds, including hydrofluorocarbons (HFCs), hydrochlorofluorocarbons (HCFCs), and chlorofluorocarbons (CFCs), are potentially harmful to the environment, particularly the ozone layer. Due to their impact, international agreements like the Montreal Protocol were established to regulate and phase out the production and usage of these substances, to mitigate ozone depletion and encourage ozone recovery.