(COLUMBIA, Mo., AP) — Authorities say 30 iPads owned by Columbia Public Schools are being held as evidence by law enforcement in various investigations.

The Columbia Daily Tribune (http://bit.ly/1O59NPs ) reports that 10 iPads are in the possession of the Boone County Sheriff’s Department and 20 are with Columbia police.

Boone County Sheriff’s Department Detective Tracy Perkins says a majority of the devices were used to share sexually graphic conversations or videos. Perkins says one investigation involves a school district employee, and the rest involve students, either as a victim or suspect.

According to Perkins, some cases involving school district iPads were referred to juvenile authorities.

The school district owns 12,000 iPads that were provided to all classroom teachers, fifth- and sixth-graders, and students in Advanced Placement courses and Battle High School students.

District spokeswoman Michelle Baumstark says not all of the iPads held as evidence are from investigations that started this school year. She says that investigations are completed, the devices are returned to the district.

Sgt. Mike Maynard with the CPD Investigations Division said there was no easy way to determine what crimes are being investigated.

According to Maynard, “Some cases may not involve the child at all, other than they were able to catch video evidence of an adult-on-adult crime on their school-issued device.”

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Information from: Columbia Daily Tribune, http://www.columbiatribune.com