IIRC (my google-fu is weak this afternoon) two way radios are not covered by the "no mobiles while driving" law. Something to do with the way conversations on such devices are structured I think, with one party speaking then the other.Most of the modern cop cars have hand-free use of radios built in (it's one of the reasons the new radio system was adopted). In older cars, the radio will usually be used by the passenger plod (if double-crewed).