Proabably use the same reason they use for ankle bracelets now...if you take it off your in violation of your parole and you get to go to prison for the full term....be cool though if HISC made one that zoned off out of bound areas....and had an alarm that went off if it was tampered with....and a push to talk to tell the indiviual that they are in a out of bounds area ...etc and so forth.