Cheerios

It's easy to spot spies. They have Smart phones that have neurotransmitter listening devices built in and scroll the input in text. they even have listening devices for their ears that are hard to spot. The good guys have the ability to cut off that text and audio every once in a while. The good guys don't need neurotransmitter decoders, we can just talk to each other face to face and know in the end that everyone is good. By 6 degrees of separation we can find friends of friends who are trustworthy and relay even more info through them. It will take time and a lot of empathy and caring to rehab people with dysfunctional brains but it will work. In the end we will find out that everybody on earth is friends and that evil never even existed.