There is a name for the profession, but I don't know it. It's not my field of expertise.
The ban? Schedule one medicine prohibited scientific research of those plants and chemicals. It wasn't until the presidency changed that, by turning a blind eye to it instead of enforcing it. The idea is if states legalize, then research should be legally allowed as well.
Where I live all of this is legal, so it's where most of the research was happening. It's legal in more places in the US today, so for all I know research is happening now in more places.