A California judge on Tuesday demanded Border Patrol agents allow people they think are living in the U.S. illegally to stay in the country, unless authorities have a warrant or reason to believe the person may flee before they can get a warrant.

U.S. District Judge Jennifer L. Thurston ruled on Tuesday that Customs and Border Protection (CBP) agents in the Eastern District of California cannot stop illegal immigrants without reasonable suspicion, or deport them via “voluntary departure,” unless that person is explained their rights and agrees to leave, according to a report from The Associated Press.

The decision comes after dozens of people were arrested in January during Border Patrol’s “Operation Return to Sender.”

The agency will be required to submit a report showing who is being held and who was arrested, along with the reasoning for both, every 60 days until the lawsuit is resolved.

CBP claimed Thurston did not have jurisdiction to make the ruling, but said it wouldn’t matter if she did because the agency had already issued new guidance and training to its agents, “detailing exactly when people may be stopped or arrested without warrants, and what rights detainees have after their arrest,” according to the report.

Thurston alleged the policy could be changed again in the future.

The Associated Press contributed to this report.