CHILDERN WHO MURDER

In the united states there is alarming increase of children who murder either their parents or friends or  just someone they know. Does the justice system try them as adults ot do they tey them as children. I think if they are old enough to know the differnce between right and wrong then they should be tryed as an adult. just like the kid that shook his baby sister to death all because of a video game should be tryed as an adult not as a juvinile.