Since Aaron Alexis killed a dozen people and wounded many others last Monday at the Washington Navy Yard, there have been a lot of questions, particularly about his mental health. I posed some of those questions to Rhonda C. Martin, a clinical counselor and trauma therapist, including how difficult it is for mental health professionals to know when a patient is a danger to himself and others, how many others are walking around hearing voices that tell them to do bad things, whether patients ever hear voices telling them to do good things, and why it’s important to understand Alexis’ history in order to treat others suffering similar symptoms — particularly veterans.

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