Sentence:  Scott Weber, the field office director for the enforcement office in Newark, said that in roughly a third of the cases, his agency would file a <WSD>detainer</WSD> or immigration charges; another third involved individuals who could be deported after their court cases; and the rest might be United States citizens or legal residents. 
Meaning of the word marked with <WSD> tags:  The right to keep a person, or a person's goods or property, against his will. A type of custody.