At least the Kiwis recognise that pacemakers and hearing aids shouldn't be switched off. BA CC have told me that pacemakers are ok 'because they don't have radios in them'. However, there are over 500,000 out there with radios.......my employer has shipped over 200k radios to a pacemaker manufacturer! Hearing aids are out there with radios on them, and then tehre are the other devices such as insulin pumps, neuro stimulators, sphincter controllers etc. Fortunately, they are all very low power and not in bands that can cause problems for avionics.
There was an enquiry once from an Australian firm about making a radio controlled implant for dealing with erectile disfunction........