DETENTION
Immigrant detention can result from raids, arrests, or simply being in the wrong place at the wrong time – Immigration Detention.
First know that you do not have to be a criminal to be detained by immigration police (ICE). All that ICE needs is to objectively believe that you are not in the country legally and they can seek to ascertain this. If they believe you to be undocumented or subject to removal (deportation) from the United States they may detain you.
In some cases ICE officers have to detain a person. For example if they have certain criminal convictions or are detained when entering the US.