The reason for his detention is mentioned near the end of the article: "After several hours, Carrillo and another detainee were driven to a privately run immig

The reason for his detention is mentioned near the end of the article: "After several hours, Carrillo and another detainee were driven to a privately run immigration detention center in Adelanto, 85 miles outside Los Angeles in the Mojave Desert." Privately run centers don't get paid based on citizenship or not but on services rendered.