evidently you are unfamiliar with experimental science or clinical trials, like it or not self experimentation and the consumption/administration of psychoactive substances is considered unethical, rightly or wrongly.
In the case of self-testing it raises concerns of objectivity, not just in terms of perception and observation but with regards to bias and intent, throwing into question the results and reasons for the study.
In the case of self-testing it raises concerns of objectivity, not just in terms of perception and observation but with regards to bias and intent, throwing into question the results and reasons for the study.