Most drug screening tests look for a compound created by the body when it metabolizes THC. To increase the likelihood that a product doesn't have more THC than claimed, some people look for a manufacturer that can provide a Certificate of Analysis, or COA, for its product. This shows the results of a company's testing for THC, CBD and various contaminants. Farm Bill was passed, federal law removed hemp-derived products from the Drug Enforcement Agency's list of Schedule 1 substances. It's still a highly regulated crop in the United States, though, with serious provisions.