PHOENIX — The head of the state prison system told lawmakers Tuesday there's nothing wrong with the system used to classify the security risk of inmates even if it did result in one prisoner being able to kill three others in April.

Ryan Thornell acknowledged that Randy Wassenaar had his custody reduced from maximum security to "close custody'' late last year despite the fact he was serving 16 life terms for a 2004 incident where he and a fellow inmate took and held hostages at a state prison in 2004 for 15 days. ×

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