What could be the disadvantages advantages of phone or in-person interviews?

What could be the disadvantages advantages of phone or in-person interviews?
Would a non-structured or structured interview be most favorable?
Is this study viable?
What would be the main limitations?
What are the ethical issues involved?
Would you be able to establish empathy with the inmates to reach quality data?
Write a paper, describing your plan for qualitative research, along with your responses to the above

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