Describe two dilemmas that counselor might face in attempting to plan research with special populations (e.g., seriously mentally ill, children, persons with disabilities

Describe two dilemmas that counselor might face in attempting to plan research with special populations (e.g., seriously mentally ill, children, persons with disabilities, elderly, other members of a marginalized group of people). What are some ethical dilemmas a researcher could face with these populations? What principles of ethical research are involved? How would you handle these dilemmas in planning your research? Include at least one peer-reviewed resource to support your response.