I did not know of her giving Huntly an earler alibi when I first posted and this does change my view.

If we make the pretty fair assumption that Huntly was resposible for the rape where Maxine Carr said she was with him the first time - he would most probably have been taken out of circulation then. He would have had a criminal conviction for rape, even with this flawed system this surely would have shown up and prevented him getting the school job. This rape victim then would have received some justice and Holly and Jessica would still be alive.

You could argue that Maxine Carr was more a cause of their death than a faulty vetting system?

Liz: That may have been hard to do but you may obtain some consolation from the fact that your daughter may be a little safer with that knowledge.