Does ATC report to the FSDO landings when reported vis below min?

Yes, but if the reported wx degrades after crossing the FAF they can
continue the approach. So perhaps if they land with reported vis below
mins they could be busted? That doesn't sound right either.

-Robert

Yes.. once the approach has passed the FAF and the weather degrades, they
can continue to MDA or MAP. If it goes down, it could come back up before
they get to the MDA/MAP/

As stated by another.. not all RVR readings on an airport are at the
approach end.

BT