The report says parole agents didn't review the data from the ankle bracelet Gardner was forced to wear after his child abuse conviction. It finds there were a number of violations by Gardner, including getting within 100 yards of places where children gather.
The report says the data was overlooked because Gardner was considered a low risk offender.
It concludes that better monitoring would have sent Gardner back to prison, making it impossible for him to murder the San Diego teens.
The 32-year-old Gardner pleaded guilty to those killings and was sentenced to life in prison without the possibility of parole.
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