DogMan85,
Unfortunately not everyone sees it that way.
It is easy for some to accept that Bull blood was added "a hundred years ago" but not to accept that it was added 30 years ago.
It offends some terriermen to believe that "their line" has bull blood in it, even when its plain to see the bull influence in the dogs.
So a "Blue Poll" might be acceptable but a Staff or EBT is out of the question. What a load of cobblers.
IMHO it is not a bad mark against a working terrier strain if bull blood is evident, if that is what the breeder wants to do.
But some guys are afraid to admit it.