The Viper Tech 6.8 million volt rechargeable black stun gun with a flash light is strong enough, detectives say, to knock down a horse.
They say the student purchased the stun gun online.
Police also allegedly found a notebook filled with threats, including a "things to do in life list" that included killing a man and a police officer, bombing a school and committing suicide.
He also allegedly checked off items including stabbing a person, stealing and witnessing a murder.
Detectives are checking to see if teachers or students were on the list, but they do know the teen's parents were targeted.
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