A former Minneapolis elementary school teacher pleaded guilty Monday to several charges involving child sexual abuse material.

In May, Minneapolis Park police were called to Brackett Field to report that 35-year-old Preston Palmer was about to give a "substantial quantity of child sexual abuse materials to another individual."

Charging documents describe a group of people who work to uncover people soliciting minors for sexual acts. A 17-year-old member of the group told Palmer they were a 13-year-old boy, and charging documents say the two had conversations that were "overtly sexual in nature."

Palmer told the 17-year-old posing as the boy that he had 87 gigabytes of child sexual abuse materials with more than 1,000 videos on what he called his "pedophone." Another group member, posing

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