Basically, cannabis is an umbrella term that includes both hemp and marijuana plants. Cannabis sativa is actually the scientific name of the cannabis plant (Cannabis = genus; sativa = species), and hemp and marijuana are just two different “varieties” of it (i.e. you could refer to both marijuana and hemp plants as “cannabis” plants, but you would not, for instance, refer to a “marijuana” plant as a “hemp” plant). Hopefully that’s not too confusing.
This all serves to underline the importance of testing CBD extract for the various levels of active ingredients. If your homemade CBD extract contains a high amount of THC it could be illegal in your country and require you use either a different method of extraction, or more likely, the need to find a source of hemp that has lower THC. As more scientific literature emerges supporting the entourage effect, and increased benefits of full-spectrum CBD compared to CBD isolate, we can expect the manufacture and sale of CBD goods based around isolate to greatly reduce in the coming years.