US Customs and Border Protection (CBP) wants eyes on everyone leaving the country by vehicle. Wired reported this week that the agency plans to photograph every person in cars going to Mexico or Canada by land, including backseat passengers.

The program would use facial recognition to match the pictures with travel documents like passports and visas. A CBP spokesperson told Wired that it wasn’t immediately apparent that the surveillance system would track self-deportations, but she wouldn’t rule out future use. “Not to say it won’t happen in the future, though, with the way self-deportation is going,” CBP spokesperson Jessica Turner said.

Among the Trump administration’s self-deportation moves have been offering $1,000 payouts to undocumented immigrants to leave the country voluntarily. It also listed 6,000 living immigrants with temporary parole as legally dead. That included canceling their Social Security numbers, effectively voiding their ability to work or collect benefits.

The outgoing border photography plan would mirror a program CBP is developing for incoming border crossings. A separate Wired report from earlier in the week revealed the agency asked tech companies to suggest how they would track everyone entering the country by vehicle, including those seated two or three rows back. It’s turning to Big Tech because its own attempts haven’t been up to snuff. A recent test of the system at a Texas-Mexico crossing showed that CBP’s cameras only met face-matching validation requirements 61 percent of the time.

The moves come amid souring immigration approval for President Trump. A late-April poll from WaPo-ABC News-Ipsos found his approval rating on immigration underwater by seven points. (In February, he had a net positive of two points on the topic.) Meanwhile, a late-April NYT-Sienna College poll found that 53 percent of registered voters said Trump has “gone too far” on immigration enforcement.