We've been talking with veterans and advocates who point out that interviewing veterans with PTSD and other people with trauma can be a unique situation. A traumatized person may talk about emotionally painful things voluntarily. But for some, it can unleash intense feelings, which the traumatized person then has to figure out how to cope with.
A few tips we learned:
Be clear about your role. You're not a counselor. Let them know what to expect from you as a journalist, what that involves (one interview, phone contact, etc.).