K.S.A 21-4218 makes it illegal to posess a firearm or other weapon in posted state buildings, but not the grounds. I am not sure that the signs meet the requirements to prevent CC. There must be at least 1" all around the symbol with no writing. I believe the writing is a little less than 1" below the symbol, although I have not measured them. The signs started going up right before Christmas. Not all of the building were marked before Christmas.
KU has areas posted as being gun free, which I do not believe is enforcable.