Gov. Katie Hobbs of Arizona on Monday signed a law that requires schools to limit access to cellphones in schools, joining about eleven other states that have adopted statewide restrictions on student devices.

The bill mandates that public and charter school districts restrict the use of personal and school devices for non-educational purposes. It also requires schools to implement policies defining how students may access the internet during the school day, including banning social media platforms.

“Education requires attention, and attention is exactly what today’s students are being robbed of by addictive devices and endless scrolling,” Beverly Pingerelli, a Republican lawmaker who sponsored the bill, said. “Teachers can finally reclaim their classrooms, and parents can feel confident their kids are actually focused on school — not their screens.”

The law is among the most restrictive governing cellphones in schools, but it appears to lack an enforcement method. Instead, school districts are expected to set their own policies. And after the bill passed the House in February, the Senate added an exception for medical devices.

Arizona’s new law does not apply to school districts that already have policies prohibiting students from using cell phones throughout the school day. It also stipulates that students and parents must be able to communicate with each other.

Hobbs previously vetoed a similar bill last year, arguing that it set “an unnecessary mandate for an issue schools are already addressing.” The veto was criticized by Republicans in the Legislature.

“There is a growing body of research that clearly links the use of wireless devices like cell phones to increased negative social harms among our youth,” Pingerelli said at the time. “Arizona middle and high schools today are flooded with students glued to screens. It’s an epidemic that is impacting everything from teen depression and anxiety, increased childhood obesity, and decreased academic achievement.”

More than 70 percent of high school teachers say that phone distraction by students is a “major problem,” according to a survey conducted last year by Pew Research that has often been cited by proponents of cellphone bans in schools.

The law comes after a pressure campaign from Tom Horne, Arizona’s state superintendent of public instruction, to ban cellphones in schools statewide. Several school districts have already done so, including those in Apache Junction and Scottsdale.

“Imagine being a teacher and trying to teach a class while students were scrolling on their cellphones. That this has been permitted is outrageous,” Horne said in a press conference in August. “No teacher should have to compete against phones for the attention of students.”

The Arizona House of Representatives began considering the bill after it convened in January. Just one senator, Jake Hoffman, the hard-right co-founder of the Freedom Caucus, voted against it in the Senate last month, citing the need to “record the insane, woke antics of teachers.”