Witnessing violence leaves scars. How to cope with the aftermath of traumatic events

By Sarah Dewberry, CNN (CNN) — Cars came to a screeching stop on Interstate 495 near Washington, DC, after a man stabbed four people in an attack that left a woman and a dog dead on the highway. The chaotic moment unfolded in Fairfax County on March 1 shortly after 1 p.m. when a Virginia