Recently we has a girl go through rush that seemed "normal" and we gave her a bid, she pledged, and she was initiated.
A few months later she starts stirring up MAJOR drama (I have written a couple previous threads about this) and decides she is going to go inactive. She basically put every member down, did some "un-sigma" like things with a sisters boyfriend (who just happens to be her big sister) and then turns around and wants to come back active again. Lets just say it was a unanimous NO!
We had to learn the hard way.