Doctors Without Borders/Médecins Sans Frontières (MSF) is alarmed by recent news reports of unsafe, unsanitary, and inhumane conditions at detention centers in Texas housing migrants and asylum seekers, including hundreds of children. These reports are consistent with what we see and hear from our patients in Mexico who were detained in the United States and recently deported. MSF does not run medical projects in the US, but our teams along the border in Mexico see hundreds of patients every week who have been deported from US detention centers. While being treated by our medical and mental health teams, people have described being held in frigid conditions in CBP holding cells known as hieleras, or iceboxes, and without adequate access to food, water, hygiene supplies, and medical care. In this interview, María Hernández Matas describes what MSF teams have witnessed.