Almost 150 guards are staffing an empty Texas prison as state officials work on Gov. Greg Abbott's plan to use it for immigrants

While many Texas prisons are understaffed, some dangerously so, the emptied-out Briscoe Unit in Dilley is in "maintenance mode" as officials scramble to implement the governor's plan to increase the state's role in border enforcement.

“They’re doing this on the fly. I don’t think anyone has thought through any of this,” said Michele Deitch, a senior lecturer at the University of Texas at Austin’s public affairs school and expert on prison and jail conditions.