The only indication I can think of, off the top of my head, that a particular psychiatrist writes prescriptions responsibly is that he chooses not to prescribe frequently or at least less frequently than the average doctor.
I imagine he would know the industry standard for % of patients who receive a prescription, including granular data like age, economic status, how patients are filtered or not before he vs. others see them, etc, and his own prescription %.
I hope you get a good doc, dj.