PORTLAND, Ore. (AP) — A voter-approved Oregon gun control law violates the state constitution, a judge ruled Tuesday, continuing to block it from taking effect and casting fresh doubt over the future of the embattled measure.

The law, one of the toughest in the nation, was among the first gun restrictions to be passed after a major U.S. Supreme Court ruling last year changed the guidance judges are expected to follow when considering Second Amendment cases.

The decision was handed down by Circuit Court Judge Robert S. Raschio, the presiding judge in Harney County in rural southeast Oregon.

The law requires people to undergo a criminal background check and complete a gun safety training course in order to obtain a permit to buy a firearm. It also bans high-capacity magazines.

Measure 114 has been tied up in state and federal court since it was narrowly approved by voters last November.

The state trial stemmed from a lawsuit filed by gunowners claiming the law violated the right to bear arms under the Oregon Constitution.

The defendants include such Oregon officials as Democratic Gov. Tina Kotek, Attorney General Ellen Rosenblum and State Police Superintendent Casey Codding. They can appeal to the Oregon Court of Appeals, and the case could ultimately go to the Oregon Supreme Court.

Rosenblum plans to appeal the ruling, her office said in an emailed statement.

“The Harney County judge’s ruling is wrong,” the statement said. “Worse, it needlessly puts Oregonians’ lives at risk. The state will file an appeal and we believe we will prevail.”

The decision is likely “the first opening salvo of multiple rounds of litigation,” said Norman Williams, constitutional law professor at Willamette University.

During an appeals process, it’s likely that the injunction freezing the law would remain in place. Raschio was the judge who initially blocked it from taking effect in December.

The different lawsuits over the measure have sparked confusion over whether it can be implemented.

In a separate federal case over the Oregon measure, a judge in July ruled it was lawful under the Second Amendment of the U.S. Constitution.

But because Raschio found it to be invalid under the Oregon Constitution during the state trial, the law remains on hold. This is because state courts can strike down a state law that violates the state constitution, even if it’s permissible under the federal constitution.

“The U.S. Constitution sets a floor, not a ceiling, for rights, so state constitutions can be more rights-protective than the federal constitution,” Williams said.

Because of this, Oregon officials would have to win in both state and federal court for the law to take effect, he said.

During the state trial, the plaintiffs and the defense sparred over whether large-capacity magazines are used for self-defense and whether they’re protected under the Oregon Constitution.

The plaintiffs argued that firearms capable of firing multiple rounds were present in Oregon in the 1850s and known to those who ratified the state constitution, which took effect in 1859. The defense, meanwhile, said modern semiautomatic firearms are “technologically distinct from the revolvers and multi-barrel pistols that were available in the 1850s.”

The two sides also clashed over whether the permit-to-purchase provision would hamper people from exercising their right to bear arms.

The Oregon measure was passed after a Supreme Court ruling in June 2022 created new standards for judges weighing gun laws. That decision fueled a national upheaval in the legal landscape for U.S. firearm law.

The ruling tossed aside a balancing test that judges had long used to decide whether to uphold gun laws. It directed them to only consider whether a law is consistent with the country’s “historical tradition of firearm regulation,” rather than take into account public interests such as promoting public safety.

Since then, there has been confusion about what laws can survive.

In her separate federal ruling over the Oregon law, U.S. District Judge Karin J. Immergut appeared to take into account the Supreme Court’s new directive to consider the history of gun regulations.

She found large-capacity magazines “are not commonly used for self-defense, and are therefore not protected by the Second Amendment.” Even if they were protected, she wrote, the law’s restrictions are consistent with the country’s “history and tradition of regulating uniquely dangerous features of weapons and firearms to protect public safety.”

She also found the permit-to-purchase provision to be constitutional, noting the Second Amendment “allows governments to ensure that only law-abiding, responsible citizens keep and bear arms.”

The plaintiffs in the federal case, which include the Oregon Firearms Federation, have appealed the ruling to the 9th U.S. Circuit Court of Appeals. The case could potentially go all the way to the U.S. Supreme Court.

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Associated Press writer Lindsay Whitehurst contributed to this report from Washington.

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Claire Rush is a corps member for the Associated Press/Report for America Statehouse News Initiative. Report for America is a nonprofit national service program that places journalists in local newsrooms to report on undercovered issues.