Well, under normal circumstances it would be PIS, but Batman is a human in the most powerful fighting force on the planet. He thinks like a human, and he knows that if only a few of the JL went rogue, only he could stop them. And he's had time to study their weaknesses and what not, so I think because of the considerable time they put into Batman being the person he is, I think it works for him.
And if you're asking if Batman created a helmet like Magneto to help him keep his mind safe. I think he might have, just because of the number of telepaths in DC. He could also probably do it through sheer training, since Magneto has blocked TP assaults without his helmet.