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"There is no doubt Google has a human touch, we reported they may have close to 10,000 evaluators and their guidelines were leaked - so this is no secret anymore.The question is, how do you know if one of these evaluators are on your site, sniffing things out?  A WebmasterWorld thread suspects that the Google evaluators come from cart.corp.google.com.  In fact, WebmasterWorld administrator said he always sees the \"first parameter\" string along with a  \"?cmd=review.\"  To him, this implies it is an evaluator. Should you worry if you see this in your log files?  Depends, are you doing anything shady or borderline? Forum discussion at WebmasterWorld."^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/archives/017650.html>