Kansas City, KS has had a ban since 1987. Incidentally, the only fatal attack in the past 20 years in the KC area happened in KCK in 2006. Nice safety mechanism. I'll never numerically be able to prove their ban isn't working. They don't keep good numbers and aren't at all cooperative with the public.
KC Missouri passed a mandatory spay/neuter of pit bulls that became active in December 2006 (following the 2006 fatality across the state line). I'm curious to see what theirr numbers are...I'm honestly not sure they've even made enough of an attempt at enforcement to even matter....their AC is such a trainwreck (and not in an interesting to watch kind of way).
What's most distrubing to me is the blatant skewing of the data in all of these media cases...where 2 years after the ban they report that "pit bull" bites have gone down so the ordinance is a success. They never even bother to ask, look for or report that the total bite numbers went up. Well, we killed 2000 pit bulls in the past year, so of COURSE the 'pit bull' bites went down, there are 1/3 as many of them now.