There was little research done for many years. The trouble once anything is declared a controlled substance research become very hard due the need to secure the substance at the lab, getting it to the lab and anywhere you need to take the substance. All this is after convincing the government that you have a case that the substance will do what you think it will and that medical use will not cause the substance to be abused. If you jump through all the hoops and complete all the mountains of paperwork, you finally have to source and import the substance. This will require more paperwork and so on in the source country.