Drug Rehab Centers

I am currently a human development and family studies major, but I have a little unsure. Personally I think the direct contact with patients during their withdrawal phases and to follow them. I'm pretty sure that vague, but the situation is special? To pursue this career would be a small advantage for me, more biology, I'd go to medical school, what with grad school? If the things I go to school in Nevada, and I appreciate all input and opinions.