Peter Duniho wrote:
Whoopee. Lots of CFIs don't have their facts straight.

Boy, I'm so glad we have YOU to set us all straight Peter.

There are several areas of the FARs where particular activities/actions
etc. are not specifically mentioned as "prohibited" but neither are
they specifically authorized or sanctioned. The FAA issues Advisory
Circulars to clarify their positions on losts of these sorts of subjects,
often stating positions which to some may seem at odds with the wording
of the FARs. In most cases they seem to come down on the side of more
restrictive than what the casual reader may glean from reading the FAR.

You can be assured that in the event of an accident/violation etc. that
the FAA will come down as holding the CFI (or whatever party supposedly
authorized/sanctioned the questionable activity) as being culpable.
Safety and good judgement is one of the criteria used to determine the
cause of incident and thats what that is emphasized to much to CFIs, as
they are to instill this into their students.

But I don't need to tell you this because you already know it all.