Where can I find information about organic food labeling?

Where can I find information about organic food labeling?

The USDA National Organic Program (NOP) develops and enforces uniform national standards for organically-produced agricultural products sold in the United States. NOP works to benefit consumers, organic farmers, and processors by taking action against those who violate the law and jeopardize consumer confidence in organic products. 

The NOP website provides links to information on labeling organic products, becoming a certified producer or business, locating certifiers, allowed and prohibited substances, and more.