LOS EBANOS, Texas (AP) — If Congress agrees on a comprehensive immigration reform bill, it will probably include a requirement to erect fencing that would wrap more of the nation’s nearly 2,000-mile Southwest border in tall steel columns.

But the mandate would essentially double down on a strategy that the Customs and Border Protection agency isn’t even sure works. And the prospect of the government seizing more land offends many property owners in the southernmost tip of Texas.

Aleida Garcia was among hundreds of people who lost property during the last fence construction spree in 2008. She would rather see more border agents patrolling the area.

The Border Patrol says it has no measurement of the fence’s effectiveness. The agency has told Congress that it needs three to five years to make a “credible assessment.”