Final answer:
The 'Scope' or 'Applicability' section of the Code of Federal Regulations states who is subject to a regulation and the circumstances of its application. Title 21, for instance, includes such information for FDA-regulated products. The Federal Register provides updates which can affect these regulations.
Step-by-step explanation:
In the Code of Federal Regulations (CFR), the section that explains who is subject to the regulation and under what circumstances is typically labeled as the "Scope" or "Applicability" section. It outlines the persons or entities that are required to follow the regulation and details the specific instances where the regulation applies. For example, within Title 21, which pertains to the U.S. Food and Drug Administration (FDA), there are different provisions and chapters for various types of products such as prescription drugs, food, and cosmetics. Each of these will have a section clearly stating the scope of the rules outlined.
Additionally, the Federal Register is an important resource that can be used to track recent changes or amendments to the regulations in the CFR. The Federal Register provides daily updates on government agency rules, proposed rules, and public notices, which can affect the applicability of regulations over time.