They have conducted some of these studies some years ago. One of the was a study on the effects of LSD [0][1] on the brain, and I if I recall correctly they were also looking for test subjects for shrooms around the same time.

[0]https://www.imperial.ac.uk/news/171699/the-brain-lsd-reveale...

[1]https://www.pnas.org/content/pnas/early/2016/04/05/151837711...