I am a CFI and was recently asked to perform a flight review for an experienced pilot.  I have noticed in this pilot's logbook that they have been performing flights with an expired flight review.  They have been doing this for a number of months/years, it wasn't just a few flights.  The regulations do not state that a logbook audit be part of the flight review, it was just something I noticed.  I have two questions.  1) Am I still able to sign this person off after a successful flight review?  (Ground and Flight portions), and 2) Am I obligated to report the illegal flights to the FAA in any manner?  I am not an FAA employee, simply a CFI.
Thanks
				
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