T o d d P a t t i s t wrote:

They only know if someone tells them - just like someone
told the FAA in all the NTSB cases on this subject.

While this is frequently the case, there are also violations that start because
an examiner happened to be in the FBO when people started settling up the bill.

George Patterson
Give a person a fish and you feed him for a day; teach a person to
use the Internet and he won't bother you for weeks.