Let's say a police officer was investigating you, would you go to him for medical advice (or advice of any kind)?
No, but if the police officer were a trained psychiatrist he or she might be able to conduct a better interrogation.
Police officers aren't doctors, and they shouldn't be.
Having interrogations conducted by trained psychiatrists might give the police a lot more information (and of better quality) than what they now get from interrogations.
When I am being interrogated, I understand that the police officer is not on my side and does not have my best interests at heart.
Why should that preclude the police officer from being a trained psychiatrist?
Likewise doctors shouldn't be police officers.
Interrogations done by trained psychiatrists might make for much better results.
For a doctor to do his or her job, she needs you trust.
Not if their job is conducting police interrogations.
Doctors don't investigate crimes or try to get you to incriminate yourself.
A trained psychiatrist would probably be good at that job.
When I am a patient, I trust that the doctor is on my side and has my best interest at heart.
When you are being interrogated by the police, you aren't a patient, even if your interrogator has had training as a psychiatrist.
Doctors and police officers both have jobs to do. But they are very different types of jobs that should be kept separate.
I see no reason why we shouldn't let trained psychiatrists work for police departments.