"The narrative is that only violent criminals are being sent to Alligator Alcatraz," attorney Phillip Arroyo said. "We don't know why [he was sent there] because he has legal status."

A federal court ruled that California's ban on private prisons and detention centers like San Diego's Otay Mesa Detention Center, owned and operated by private company CoreCivic, and where migrant children were detained separately from their parents, is unconstitutional. (ROBYN BECK/AFP via Getty Images)