Dozens of immigrants who illegally crossed into the U.S. via a newly established military-controlled zone along the U.S.-Mexico border have had their trespassing charges dismissed. 

Chief U.S. Magistrate Judge Gregory Wormuth began filing the dismissals late on Wednesday, ruling the immigrants did not know they were entering the military zone – known as the New Mexico National Defense Area (NMNDA) – and therefore could not be charged, according to court documents.

Wormuth ruled that the federal government failed to demonstrate probable cause that the immigrants knew they were entering the zone.

The government had argued in a criminal complaint that the military had posted signs in the zones stating in both English and Spanish that it was a restricted area and that unauthorized entry is prohibited.

US MILITARY STATIONED AT THE BORDER IN NEW MEXICO NATIONAL DEFENSE AREA CAN DETAIN ILLEGAL MIGRANTS

Despite signs indicating restricted access, the judge noted that the challenging terrain made it unlikely that the defendants saw the warnings.

The decision marks a setback for the Trump administration’s border crackdown as the trespassing charges were central to enforcing the NMNDA.

READ THE ORDER – APP USERS, CLICK HERE:

The NMNDA was established in April and spans approximately 180 miles along the southern New Mexico border. U.S. Army personnel now patrol the area and are authorized to detain unauthorized entrants.

“Beyond the reference to signage, the United States provides no facts from which one could reasonably conclude that the Defendant knew he was entering the NMNDA (New Mexico National Defense Area),” wrote Wormuth in a 16-page ruling. Wormuth has served as a U.S. magistrate judge since 2009. Magistrate judges are appointed by district court judges and not by the president.

The judge dismissed two charges faced by the 98 arrested immigrants: violation of a security regulation and entering military property for an unlawful purpose, both misdemeanors. A third misdemeanor charge of entering the U.S. illegally remains.

Up to May 9, Ellison’s office reported charging 339 migrants for entering the New Mexico military area.

TRUMP ORDERS MILITARY TO TAKE CONTROL OF FEDERAL LAND AT SOUTHERN BORDER

Last month, Secretary of the Interior Doug Burgum visited New Mexico to announce that the Army was taking control of the federal land as part of the Trump administration’s efforts to curb illegal immigration and trafficking.

The 109,651 acres of federal land was transferred to the Army for three years, subject to valid existing rights.

The switch in jurisdiction allows the government to protect sensitive natural and cultural resources in the region, while helping the Army support U.S. Border Patrol operations in securing the border and preventing illegal immigration, according to the Department of the Interior.

In March, the Defense Department authorized the military to patrol the southern border to provide “enhanced detection and monitoring” to support U.S. Customs and Border Protection.

Fox News Digital emailed and called a Department of Justice attorney involved in the case for comment.

Fox News’ Louis Casiano and Reuters contributed to this report.