At what point do we say, “No kids for you!”?

Reading this story in the Everett Herald about the death of a 19 month old girl abandoned (with her sibling) in a car due to a neglectful mom who “had a history of neglectful treatment. Four other children were removed from her care in the past, according to the state records” I found myself wondering at what point do we (and/or tribal governments), decide that an individual should NEVER be allowed to have kids. Is 4 chances not enough? These children were left alone for days, covered in feces, lice, and filth–alone–to rot like garbage left in a can.

I hope one of the debates opened in the aftermath of this is at what point can a history of an individual allow the state to pre-determine they are unfit to be a parent.