This was a sci-fi tv show/episode (or movie?) where people inserted a pin/bolt into the back of people’s neck & disappears and somehow either changed or gained info. But it’s different in the sense of Matrix where you sit in a seat & the insert is part of chair of where you’re sitting it doesn’t disappear completely in the neck as what I am trying to remember. It’s like you wouldn’t know it unless you knew they did it.
Time period being most likely 99s/2000s but could be as wide of time of coming out (1980s-2010 at most)