In my personal experiences working in a clinic, we RARELY have to muzzle pits that come in for fear of aggression issues. The few we do muzzle is usually for procedures they may find uncomfortable or painful (in which case we'd muzzle ANY dog for it, not just pits).

We have to muzzle FAR more small breed dogs, German shepherds, have to muzzle *every* rhodesian ridgeback that comes in... but rarely any pits due to aggression.

I think BSL is a load of crap. If they want a legislation that will work, they need to focus on the owners, not the breed.