Nigeria, April 23 -- Emmanuel Egbo was 13 years old when a police officer killed him.

Think about the 13-year-olds in your life. They laugh a lot. Play a lot. Emmanuel was just like that. He loved to play football. Whenever he returned from school, he would finish his homework - if there was any - run errands like fetching firewood and planting cassava for his mother, then run to the field to play football.

On the evening of May 26, 2008, in Attakwu, a town in Enugu State, Emmanuel was in front of his uncle's house playing ball one evening when trouble came. What was the trouble? Nigerian police. The police officers walked up to Emmanuel and asked him what he was doing. He stated the obvious: He was playing football.

One of the police ...