I've gone through the criminal law course offerings, and didn't see a course that seems to specifically address dealing with this sort of thing. Further research seems to indicate that lack of specific training in this area may be a problem with the profession.

Columbia course offerings: http://web.law.columbia.edu/courses/search

Vicarious Trauma in the law profession: http://lawstreetmedia.com/issues/health-science/vicarious-trauma-can-legal-culture-make-worse/