This concept of a Riff Trial is new to me. Sounds like it would serve as a great pre-trial method to hone in on designs for more serious trials, one with contro

This concept of a Riff Trial is new to me. Sounds like it would serve as a great pre-trial method to hone in on designs for more serious trials, one with controls and blinding. Is this already the case? Or are riff trials generally only performed in citizen research?