>> another blood test showed cheney's potassium levels were normal. but this level of scrutiny over dick cheney's health is a rem d reminder, he is no ordinary patient and caring for him often required extraordinary precautions. in 2007, when cheney needed his implanted defibrillator replaced, dr. reiner ordered the manufacturer to disable the wireless feature, fearing a terrorist could assassinate the vice president by sending a signal to the device telling it to shock his heart into cardiac arrest. >> and it seemed to me to be a bad idea for the vice president of the united states to have a device that maybe somebody on a rope line or someone in the next hotel room or downstairs might be able to get into, hack into, and i worried that someone could kill you. >> it might sound far fetched, but years later, this scene from the showtime drama "homeland" showed just how it could be done