In today’s enforcement environment, detention can happen fast—at an ICE check‑in, after a court appearance, during a traffic stop, or without warning. In many cases, families and counsel are trying to locate someone while the person is already being moved through ICE’s rapid transfer network. When detention is legally questionable—or when due process has been skipped—one of the most powerful emergency tools available is a federal habeas corpus petition (28 U.S.C. § 2241), som