The second-largest school system in the country has doubled down on its commitment to protect undocumented immigrant students from federal immigration authorities.

On Tuesday, the Los Angeles Unified School Board passed a measure saying that school employees should not allow Immigration and Customs Enforcement officials on campus until the school system’s superintendent and district attorneys agree that the federal agents can be present. According to Southern California Public Radio, the resolution marks the third such move the board has taken in the last 15 months. The Washington Post reported that Tuesday’s move was influenced by the arrest of Romulo Avelica-Gonzalez, a father who was arrested after dropping off his daughter at school in March.

“It reinforces that information about what you are not allowed to do…whereas before, it may have been thought as discretionary,” Sylvia Torres-Guillén, the director of education equity for the American Civil Liberties Union of California, told SCPR. “I think that’s an important distinction.”

Additionally, the resolution made it so schools in the system can’t ask about a student’s status. It also outlines that district will help with legal support for any undocumented immigrants students if need be.

“We know that there are things beyond our capacity, so we are not offering any undocumented students or their families or an employee a magic bullet,” board member Monica Garcia told the Los Angeles Daily News. “What we are saying out loud is that we are going to focus on doing our job and that our students, our families, their support, they are welcome in our schools.”

The L.A. board’s measure comes after a February 2016 resolution issued to protect students from ICE. In 2011, ICE outlined that students are not in danger of being grabbed at schools, with schools and churches deemed as “sensitive” locations.

Other cities, such as Denver, Chicago and San Francisco, have also passed measures aimed at protecting their students and keeping ICE out.