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The issuance of RQ and RQ-lite, that is CIT 0171 and CIT 0520, has been overtly fact-based, criteria-driven. No one has suggested otherwise.

There is a lot yet not known.

Great post (rich in quality with detailed explanation). I agree with most things you had written- especially your last sentence.

I would not have even posted in this thread, except I had to disagree with the thread title and Original post. I don't consider it as RQ mystery solved.
 
By the way, elevated TSA screening does NOT purport to be entirely random. Some extra screening is purportedly random. But the additional screening many travelers are subjected to is fact-based, criteria-driven. Obviously. They are trained to identify reasons for suspicion and employ extra screening when they do.

I know TSA topic is kind of irrelevant here- I used it to illustrate as an example.

But just to close that topic from my end- I think it's called Secondary screening. Every single time I have been subject to Secondary screening (and it's a fair bit)- the TSA agent always says it's random. I don't have a problem with it- I just find it amusing that they always tell me that I have been selected at random.