Sitting behind her strikingly barren desk, with the bright, mid-winter sunlight breaking through the trees and streaming through her office windows, Martha Grace Duncan, a professor at the Emory University School of Law, in Atlanta recounts the case of nine-year-old Cameron Kocher. As she speaks her small, compact frame remains nearly motionless, betraying no emotion. But her eyes tell the story, portraying the internal mix-up of sadness, passion and nerdy intensity that she feels about the topic. Duncan may not wear her heart on her sleeve, but if you pay attention it’s not hard to find. In March 1989, on a cold, snowy day in the Pocono Mountains of northeastern Pennsylvania, Kocher fatally shot a seven-year-old playmate with a high-powered hunting rifle.