Interesting. I am following a thread in a discussion group about implants in general and theri are devices that can trace these devices. The sense signal transmissions from them. Many have found that using a high energy magnetic pulser is capable of blowing them out once you know where they are located.
You may also be interested in reading some info in my recent post in the Breaking News Forum. Seems there is a new plan of attack that needs a way to deal with it.