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BARTLESVILLE, Okla. -- Hours before a gunman opened fire at a Connecticut elementary school, police in Oklahoma arrested a teenager for allegedly plotting to attack his high school and trying to recruit classmates to help him.Sammie Eaglebear Chavez Arrested In Oklahoma School Shooting, Bombing Plot

So here's an instance when the person was found out beforehand. Hopefully, the authorities will use this rare opportunity to try and gain some understanding rather than just abuse and vilify him.