Some unregistered staff can work in other roles, for example as phlebotomists (taking blood samples), ECG technicians (recording electrocardiograms) or smoking cessation therapists, a scheme currently being employed in a number of general practitioner surgeries. Others can expand their ward-based role to include these tasks and others. There are few areas of nursing practice that cannot be legally performed by suitably trained non-registered staff, although they cannot fully replace them, as they legally must be supervised (either directly or indirectly) by a fully qualified registered nurse.