not on pakistani but UN judicial system! because clearly he said hey guys i am in lahore call me P.S. I LOVE you! but no one did! someone should ask U.N the question!
There is no question to point finger at International Criminal Court (I suppose you meant that), Since Hafiz Saeed wasn't tried there (Right now it's not possible, because both India & Pakistan have not ratified ICC).
Interestingly, Hafiz Saeed moves around Pakistan freely despite the fact that he is listed in Pakistan's National Watch-List.