How did they know that it is the 10 year old kid who started the wild fire in California?
This is not like a murder mystery or a flight where they can use surveillance cameras. I also read the boy confessed. How did he know that caused a fire so great? He set fire to a forest?
This may answer some of your questions. http://news.yahoo.com/s/time/20071107/us_time/willachildbechargedinthefires