Surely this analysis is completely flawed unless they were able to introduce placebos unwittingly to the participants who thought they were microdosing? Otherw

Surely this analysis is completely flawed unless they were able to introduce placebos unwittingly to the participants who thought they were microdosing? Otherwise you've got a bunch of people who are the sorts of people who are going to try microdosing. Of course they're going to answer questionnaires in a way that scores them as less depressed. Firstly because they're less depressed people (can be bothered to work out how the hell to get hold of the stuff) and secondly because they're not stupid and know what sorts of answers will influence the score in what direction). Totally did not read the paper. Someone tell me I'm wrong please!