A Guardian investigation into the Alexandria, Louisiana, facility reveals a pattern of alleged due process violations, previously unreported accounts of neglect and abuse, documented health emergencies and long stays

He arrived in Alexandria exhausted and sick.

It was early April, and Amilcar Lisser-Posadas – shackled at his hands and feet – had been transferred from a nearby immigration detention center to this remote US immigration facility in Louisiana. He feared it would be his last stop before deportation.