The devil (as usual) is in the detail. It will be at CASA discretion to allow one who fails the Ishihara to take another form of the test.
To a cynic it could look like a case of CASA trying to get back at Dr Pape after he bloodied their nose on this issue in court. ie "you beat us in court with all your science, so we'll take the courts out of the equation." It's so much easier when you are not accountable.
