geauxtohell
Choose your weapon.
Unlike physical health problems and medical conditions, there are no laboratory tests such as blood and urine analyses or x-rays to assist practitioners to definitively diagnose mental illnesses. Instead, practitioners generally rely on listening carefully to patients' complaints and observing their behavior
Have you ever heard of the "blood brain barrier"? It's this thing that surrounds the CNS and provides a barrier from the blood and the brain. Very few things cross it, so of course their is no blood test for chemicals in the brain (urine comes from blood so that's redundant). You have to do a lumbar puncture (spinal tap) on someone when you think they have meningitis, because the WBCs remain in the CSF. You can't do a WBC count by drawing blood peripherally.
Again, you toss these facts around like they are automatic indictments. It's not at all novel to people within the field or who study the body. I've never heard a psychiatrist claim their practice was anything but clinical diagnoses. That's the whole point behind the DSM IV. As someone pointed out, that doesn't mean this is a static issue. Just as cancer existed before X-Ray, CTs, ways to detect cellular markers, and MRIs.
Underlying the whole issue is this basic fact: it's all good and fine to toss stones at the establishment, but you provide no realistic alternative to deal with a very real medical problem that has emotional symptoms.