These stories about how the technology is still in the experimental stages are all bogus and intentional disinformation. Many thousands of people already have their brains implanted with this tech 100% NON-CONSENSUALLY. It is called synthetic telepathy. It transmits not only what you hear but what you see, think and feel back to the originator. Just google "targeted individuals or "synthetic telepathy" and you will see what I mean.
A lot of new age people are duped into thinking they have developed telepathic powers due to being "spiritually advanced" or "in tune with the earth" or other such BS. In reality they are MKULTRA mind control victims of the present day.
Military black operations have been carried out for years to put the tech into people's heads. Remember all those "alien abduction" stories in the media for the past 10-20 years? Those people really were being abducted and implanted, but not by aliens.
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