Michigan's state Supreme Court ruled Friday that public schools in the state can ban adult guests from carrying firearms on campus.

Fox News reports that the court ruled 4-3 that school districts in the state do not need to comply with state law requiring schools to act in accordance with the state legislature on gun policy.

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The case originated in 2015 when an Ann Arbor man with a concealed-carry permit brought a weapon to a school, frightening some students and staff and causing the school to ban all weapons except registered police equipment.

Police officers are still excused from the ban under current policy.

Michigan law had allowed a person with a concealed-carry permit to enter a school with a weapon openly holstered, Fox noted.

School districts in two Michigan areas, Ann Arbor and Clio, currently ban all weapons from school premises, with the exception of those carried by law enforcement.

Michigan's Republican Gov. Rick Snyder appeared to break with President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE earlier this year over the president's call to arm teachers to defend schools, saying at the time that "more guns" was not the answer to school shootings.

“I don’t think having more guns is a good thing,” Snyder said. “Let's address it in a thoughtful way."

Despite this, Michigan lawmakers in March were considering a bill to arm teachers in the state, though the bill has not yet been voted on.