You can't see that they're in violation: the RF transponder effects compliance and you pay when using the lane, if you're talking about the lanes i used to use to great effect, for money.
However, when you’re looking at 100’s of cars doing the same thing false positives only account for a small percentage of that.
And the point about cops is exactly the issue - there is an actual human who observes and notes that it was a false positive, vs an anonymous report with no counterpoint entered into whatever database is tracking these reports.
And I think at certain times it's only >= 2 people.