Wild Card's description 
Advances in brain machine interface (BCI) may lead to radiotelepathy, enabled by direct conversion of neural signals into radio signals and vice versa, and the placement of micro/nano radio transmitters and receivers within the tissue of a living brain. The physicist Freeman Dyson estimated that a system of 10^5 tiny transmitters inside a brain could observe and transmit in detail the activity of an entire human brain. Dyson speculated that Radiotelepathy could become powerful instrument of social change, used either for good or for evil purposes. It could foster mutual understanding and peaceful cooperation of humans all over the planet, or lead to tyrannical oppression and enforced.