A Carroll man arrested in October 2023 for sexual exploitation of a child and child pornography production has been ordered to serve 600 months in prison. According to the United States District Court for the Northern District of Iowa, 48-year-old Lucas Oliver Knowles will serve 50 years after pleading guilty to four felony counts for sexually abusing a minor female, received, stored and created child sexual abuse material (CSAM) and possessed firearms as an admitted methamphetamine user. Knowles has also been ordered to 13 years of supervised release upon completion of his prison sentence. Knowles has remained in custody at the Sioux County Jail from October 2023 to his sentencing hearing that was scheduled today (Friday) March 14.