You're right about the physics experts. Man, those guys will say anything depending on who pays them. Utter shit. I'm glad that most judges these days see it that way too.
The thing with psychology is mostly that I don't see a scientific process in making the diagnosis. I understand that DSM uses criteria for disorders. But whether or not a person meets those criteria is largely subjective. Sometimes the criteria are so broad that any given person is bound to meet them anyway. Not to mention the fact that mosts tests require a judgment from the tester.
And then there's the absolute quackery that psychologists and psychiatrists continue to use. I have seen countless psychiatric reports in court cases use Rorschach tests for example.
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The entire reason it exists can boil down to the simple question: cui bono?
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Honestly I realise the article been widely criticised and you know, maybe it is a bit harsh, but this is how I feel about psychology really:
http://articles.latimes.com/2012/jul/13/news/la-ol-blowback-pscyhology-science-20120713