You may not leave your home between 5pm and 9am; you may not receive visitors without permission; you must wear an electronic tag at all times. Those are among the requirements that have been imposed on 40 people over the past four years through "control orders", restrictive conditions that the home secretary may place, with the agreement of a judge, on anyone he believes to be a terrorist. Seventeen people, including British citizens, are restricted in this way at the moment.
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