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Unfortunately I do know about mental illness having dealt directly with a mentally ill relative of my husband, her psychiatrist, her psychologists, the hospital, an her manipulation techniques. Mental illness is very complex, changes over years, and is sometimes undetectable by outsiders.
My experience dealing with this person has made me VERY aware of mental health problems and the mental health system.
Ivins could have easily worked and been a brilliant scientists for years and still have suffered from mental illness.
Duley was not his therapist. She was in group therapy with Ivins.