The amusing part is that we can't even guess (accurately) what the actual tell will be. Somehow I don't think the time gap between blinks is going to be it. I'm betting it's going to be slang-based. There's a reason kids use slang readily, and it's often to separate the worlds of adult regulators and the 'more free' children/teenagers. Imagine AI trying to keep up with the slang, but just like adults, it will be unable to use it in the same way with all the pseudo-information packed into it.