The science around cannabis, includes the physico-chemical and experimental sciences (nature and matter, biology, and especially medicine). But also the human sciences, which concern man, his history, his behavior, the language, the social, the psychological, the political.
The acquisition of knowledge recognized as scientific goes through a series of steps. The collected data allow a theorization, the theorization makes it possible to make forecasts which must then be verified by the experimentation and the observation.
A theory is rejected when these forecasts do not fit the experiment. The researcher having made these verifications must, in order for scientific knowledge to progress, to make this work known to other scientists. These will validate or not his work during an evaluation procedure.