I'd like to focus my question on the implemention of a deportion order and a failure to comply.
(Context: Trump initially ordered ICE to "round up" persons who have either defied a court-ordered deportation (presumably with no available appeal to the order), or who have willfully refused to appear for a court ordered deportation hearing.)
What I don't understand is what happens that allows a person, who has been court ordered to be deported, the ability to ignore that order. Why aren't such persons taken into custody immediately by ICE (or what ever appropriate agency) and removed.