Five-year-old who fatally stabbed twin brother won’t face charges in California

State policy presumes children younger than 14 are incapable of committing crimes unless they knew its wrongfulness' at the time

A five-year-old California boy who fatally stabbed his twin brother last week won't be charged with a crime, according to authorities.

The case illustrates how many US states have policies setting a minimum age for prosecution, taking into account knowledge of wrongfulness and criminal intent. In California, children who are younger than 14 are presumed to be incapable of committing crimes unless at the time of ... the act charged against them, they knew its wrongfulness", according to the state's penal code.