None. You are not free to go whether "detained" or "under arrest."
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Arrest is criminal in nature, whereas detention for the purposes of immigration is not criminal. Detention is when the immigrant is taken into custody during deportation hearings. An immigrant is released from detention either upon being deported, or upon winning their immigration case and being released.
To be arrested means taken into custody by the police (City, State, or Immigration). Generally, people in jail because of immigration are said often referred to as being "detained" and in jail for criminal activity are are referred to as being "in custody." I really don't know your situation but seems like you need an immigration attorney that deals with deportation, again, really don't know what you are asking.
Raja S. Gill | Attorney At Law | Gill Law Group
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