USPS
https://about.usps.com/postal-bulletin/2019/pb22521/html/updt_002.htm
USDA Resources
https://www.ams.usda.gov/rules-regulations/hemp
FDA Resources
https://www.fda.gov/news-events/congressional-testimony/hemp-production-and-2018-farm-bill-07252019
https://www.fda.gov/media/128156/download
FDA CBD Enforcement Letters
https://www.fda.gov/news-events/public-health-focus/warning-letters-and-test-results-cannabidiol-related-products
FDA GMP Guidelines
https://www.fda.gov/cosmetics/cosmetics-guidance-documents/good-manufacturing-practice-gmp-guidelinesinspection-checklist-cosmetics
FDA Dietary Supplement Labeling Guide
https://www.fda.gov/food/dietary-supplements-guidance-documents-regulatory-information/dietary-supplement-labeling-guide-chapter-iv-nutrition-labeling#4-43