Although the dope angle was not a factor in this case I think it played a big part in neglect of the child.
Did you ever read the deposition of Jesse Grund, the boy she claimed was the father until his family insisted on a paternity test? He said Casey takes on the characteristics of those she is around. His example was that his own family was very religious and she became religious around them, then started smoking a lot of pot while dating whichever of the guys was a big smoker