Packaging law is complex, covering many different areas including labeling, environmental, structural, and intellectual property laws. It depends on the product contents, intended use, and materials used. The main regulatory agencies are the FDA, which regulates food, drugs, cosmetics and medical products, and the FTC, which regulates consumer products labeling. Packaging laws must be considered at both the federal and state levels due to the principle of federalism. Understanding the scientific and political aspects of packaging laws is also important, as regulations do not always strictly follow science due to outside pressures.