Final answer:
In the context of the question, 'authorized to prescribe CS' refers to healthcare professionals who can prescribe controlled substances. 'Registered or exempt from registration' pertains to the requirement for them to be registered with regulatory agencies or qualify for exemption.
Step-by-step explanation:
In the context of the question, the abbreviation 'CS' likely refers to controlled substances. An individual who is 'authorized to prescribe CS' is a healthcare professional who has the legal authority to prescribe medications classified as controlled substances. These professionals, such as medical doctors, nurse practitioners, and physician assistants, possess the necessary qualifications and licensure to prescribe these substances responsibly and safely.
The phrase 'registered or exempt from registration' pertains to the requirement for healthcare professionals who prescribe controlled substances to be registered with the appropriate regulatory agencies. In the United States, the Drug Enforcement Administration (DEA) oversees the registration process. However, certain individuals or entities may be exempt from this registration requirement, such as veterinarians or certain research institutions.