People should not be suprised that this stuff potentially exists or just dismiss it as conspiracy theory. Mind control is what the Nazi's were after and the CIA continued where they left off, with their now famous MK-Ultra operation. They were willing to abuse the brains and minds of countless people using substances to see if they could better control the human.. you would be incredibly stupid if you believed they weren't still doing exactly that in the current era. The CIA continues to operate as an entity above Congressional oversight and law, and now there's a multitude of other alphabet agencies and military operations that are also working in tandem to perfect this technology.
The big question, is it possible? I wish i believed it weren't, but the human mind is extremely vunerable to impressions from the outside. Hypnosis is incredibly easy and nearly everyone is subjected to it from birth (you think you want to work, buy all that consumer shit?). But a direct link into the brain would be even more potent using computers and mathematical software. For this reason anyone who would willingly get some kind of computer/body-mind interface or chip implanted is a complete fucking moron. Having said that I bet they don't even need that.. the brain is electrical, I'm sure the right frequencies on the right part of the EM spectrum could influence what happens inside our skulls.