Well the practice of medicine is based upon science, but there is also the 'art' aspect where a practitioner makes educated guesses.
It's still a science, not really an "art", but it's an imprecise one. There is much more normal variation to deal with in medicine than there is in, say, engineering.
But we are looking at the point of view of the mental health industry. From this logic all mental health practitioners are practicing psychaitry at some level, just like nurses and EMT's practice medicine at some level.
Agreed, but on a very very low, rudimentary level.
So why does this make psychaitry more woo resistant than psychology? I have still not gotten an answer about that statement from anyone. Or a reason why from a mental health perspective they should be viewed at as highly seperated.
Psychiatry is based on a physical etiology model, like the rest of the medical field; and thus is capable of more and simpler experimentation and falsifiability. Psychology doesn't have as concrete a basis, and is dealing with something that is still poorly understood and extremely imprecise; and falsifiability is much much more difficult.
Does this mean that a phycologist who treats people is practiceing psychiatry then?
No, the fundamental difference is the model they are based on. A psychiatrist who prescribes medication does so based on a medical/physical etiology model, with the drugs intended to correct or mitigate the physical/neurochemical disorder which causes the mental dysfunction, very likely on a permanent/chronic treatment basis. The psychologist, if they do prescribe medication (which IIRC they can't without actual medical training), would do so based on the behavioural/psychological etiology model, with the drugs intended to provide a
temporary palliative while the behavioural issues were being addressed.
Examples of the differences:
A psychiatric treatment would cover disorders such as schizophrenia and bi-polar disorder, which are accepted as physical/neurochemical dysfunctions (and in the case of schizophrenia, potentially degenerative), although their actual etiology is still poorly understood. Drugs would be prescribed to make up for deficiencies/excesses or malfunctioning neurochemical mechanisms, or to allieviate symptoms caused by a degernative disorder. Since correction of the underlying physical dysfunctions is currently beyond our technology, medical treatment is generally assumed to be a more or less permanent necessity to ensure relatively normal functioning.
A psychological treatment would cover something like PTSD, a purely psychological reaction to severe trauma. It might include medications such as sedatives to control the extreme symptoms while the behavioural treatment addresses the causes of the disorder, with the goal of restoring normal functionality and dispensing with the drugs.