Ethically, counselors and researchers may only use deception in studies when there are no feasible alternatives, the study has significant scientific, educational, or applied value, and participants are debriefed as soon as possible after participation. Deception should never be used simply because the subject is controversial or to avoid informed consent without justification.
Reference: Helwig, A. A. (2020). CPCE Study Guide and Review; American Counseling Association (ACA) Code of Ethics (2014); American Psychological Association (APA) Ethical Principles.