Speaking of which - it seemed that after a period of frequent PreCheck "random alarms" requiring additional screening, the "random alarms" fell down to a seemingly more "random" low number.

Now, my observations show that alarms are once again increasing in frequency, only they don't call them "random" anymore. I learned yesterday in ATL that TSA now refers to them as "quotas."

The "quota" designation means that they now have a set level of PreCheck pax per day that must undergo additional screening, i.e. hand swab, scanner, or patdown.