About 10 years ago, a recent college graduate named Francisco Cantú told his mother what seemed like good news: He got a job.

"I think she was terrified when I decided to join the Border Patrol," he says. "And I think she was also confused about why I was doing this."

Cantú had studied the border in school, but he wanted to understand it more deeply. He attended the Border Patrol Academy and emerged equipped to patrol the Arizona wilderness.

He says, "The first time you're thrown a set of keys, you're often sent to one of these lookout positions. And I remember, like, standing outside of my truck and just looking out at the desert on all sides of me. And I'm someone who grew up in the desert, so it's not unfamiliar to me, but I'll never forget that feeling. I felt, you know, completely overwhelmed. It was like I was looking out across the ocean. I mean, that's how vast it is."

Cantú left the Border Patrol in 2012. His new memoir is called The Line Becomes a River.

Interview Highlights

On encountering a middle-aged mother who was abandoned in the desert while crossing into the U.S.

I remember sort of bandaging her feet and cleaning her wounds, which is this very, you know, direct, tangible way of helping someone. I think it's almost biblical, in a sense, to clean someone's feet. And I remember her looking down at me just kind of, like, very tenderly and thanking me. And I felt like, "Don't thank me. At the end of the day, I'm taking you back to a cell and I'm sending you on your way to be sent back to this place that you're literally risking your life to flee." And so, yes, it's true that the Border Patrol does good work and rescues people and saves lives, but there's tension there.

On his experience with border fencing

In the station where I worked, we had quite a bit of border fencing — a wall. It was 20-foot-high steel mesh and, you know, guys on the south side found a way to pry open these steel panels and put a hydraulic tire jack underneath and jack them up and lift them high enough to drive cars underneath. And, you know, when that didn't work, they would show up with welders and weld holes just big enough for people to walk through or to crawl through. And so I really think, no matter what obstacle we put at the border, it's going to be subverted. People are going to find a way up, over, under or around it.

On being watched as he was watching the border

If you're anywhere within 40 to 80 miles of the border, you're being watched by cartel scouts. But of course you're also being watched by the United States government. I mean, our border is one of the most heavily patrolled, surveilled terrains that there is. And so when I go out now for a hike or for a day out in the borderlands and, you know, explore some little canyon, I'm always kind of conscious of that in the back of my mind: "I wonder who's watching me right now."

On the supplies Border Patrol agents carry with them

What any Border Patrol agent always carries with them is a tricky bag, we call it a tricky bag. And in your tricky bag, you've got binoculars; you've got the paper forms that you need to fill out in the field if you apprehend someone; you've got about five, six, seven, eight, nine different flashlights, because the worst thing that could ever happen to you is to run out of light in the middle of the night somewhere; and water — and not just for you but for whoever you might happen to encounter in the field....

The standard-issue sidearm is a HK P2000 .40-caliber. And you have the option at the beginning of every shift of checking out an M4 rifle or a Remington 870 shotgun. You know, we call that a longarm and, you know, if you're a cautious, careful agent, you're usually going to check out one of those weapons from the armory before you start your shift.

On one of his most memorable experiences as a Border Patrol agent

I'll never forget as a Border Patrol agent bringing this guy into my station, part of a group that I apprehended, and I was rolling his fingerprints and putting him into, you know, the database to be shipped back to Mexico. And I remember him just kind of like looking around while I was asking him these formulaic questions. And he's like, "Hey, I know there's a couple hours before the bus comes, is there anything that I can do? Can I take out the trash? Can I clean the cells? I want to show you that I'm here to work."

It changed things for me to have someone in front of me and say that to me. And so those are the kind of things that I carry with me. I think there's nothing as powerful as an individual story, and I think we need to listen to the people who have those stories right now.

Dave Blanchard and Shannon Rhoades produced and edited this interview for broadcast. Sydnee Monday and Nicole Cohen adapted for the Web.

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