Pit bull dogs allowed in Western Australia? and how many types of pit bulls are there?

Pit bulls are banned in Australia, the only people that are allowed to have pitbulls are the people that owned them before the ban- which I think was around the yr 99 or 2000. And those dogs must be deed, kept in a cage at all times with a dangerous dog sign that meets the councils regulations, when out in public the dog must always be restrained and have a muzzle on. No apbt is allowed to be imported into Australia. U are allowed American staffys which are decedents from the original pit bull but was purely bred for the show ring.u are also allowed English staffys and bull terriers, just not the original apbt or any mix.( working pitbull)