No, this is nonsense. We have quite enough real tyranny to fight without the tin-foil crap.
http://www.csmonitor.com/Commentary/Opinion/2009/1123/p09s04-coop.html
again here mentions implant
A heart pacemaker has a radio frequency to monitor and calibrate the device, even to turn it off.
It has information in it to identify the patient and the personal information about him so the data recorded goes with the right patient record.