(ONN) – The Ohio Supreme Court has ruled that school districts must provide police-level training to employees before they can carry a gun at school.

At issue was a policy adopted by Madison Local Schools in Butler County in southwestern Ohio.

The district voted to allow armed school employees after a 2016 shooting in which two students were shot and wounded by a 14-year-old boy.

A group of parents sued the district in September 2018 to prevent teachers from being armed without extensive training.

The Ohio Supreme Court ruled 4-3 Wednesday that armed school employees must undergo an approved basic peace-officer training program or have 20 years experience as a police officer.