Authorities say a Florence man is in custody on suspicion of 10 counts of sexual exploitation of a minor. Pinal County Sheriff's officials say 26-year-old Aaron-Caleb DeCook is being held on $100,000 cash bond. He was arrested after a four-month investigation that began with the discovery of images of child sexual abuse that were being traded online from an address in Arizona. A Texas detective first encountered the images in September 2014 while working with an agency assigned to combating online child exploitation. The investigation was sent to a special agent with the FBI working in Arizona's Internet Crimes Against Children Task Force.