>federal law doesn’t prohibit the discussion of classified information over unsecured networks."

Seriously? "Oh, man, we sure left a loophole you can drive a truck through! Better update the training materials to make sure clearance holders know this is kosher..."

Sorry, but my prior on this claim is just way too low to casually accept that the analysis, as given in the first link, is plugging the relevant laws into the facts. Classified-material law just doesn't make sense if something like that is legal.