There are no biological tests for any mental illnesses. No tests that can prove anyone has a "mental illness". No specific tests to differentiate between, let's say... schizophrenia and bi-polar. No specific tests to confirm the diagnosis or to gauge improvement, such as a blood tests or x-rays. No rational science behind what they think is the cause of the symptoms. Psychiatry is largely opinion, being labeled as disease. The medications dispensed, without exception, introduce chemicals that alter the brain in ways that can be very damaging.
Perhaps we should look deeper before blindly trusting "authorities" with our mental health.
Interesting relative links for more info: