4 Investigates: New Mexico’s militarized southern border

4 Investigates: New Mexico’s militarized southern border 4 Investigates went to the border and discovered while safety is improving, there is still widespread confusion.

The New Mexico National Defense Area was established on April 15, 2025, by President Donald Trump. Almost two months later, there is still widespread confusion about the boundaries of the 170-mile stretch of land, access, and rules.

Prosecutors have had difficulties enforcing the legal penalties against trespassers, but tout “operation control,” of the southern border as an early success.

4 Investigates met with local law enforcement, a former DEA agent, business owners, outdoor enthusiasts and a rancher to see how changes on the border are impacting New Mexicans.

The number of encounters with U.S. Customs and Border