There is no protection, under the PAS theory for children who have actually sufferred physical, sexual or emotional abuse, due to such abuse being virtually impossible to ‘prove’, due to the childs age and general legal disbelief of children’s disclosures…

Parental Alienation Syndrome: When is ‘Parental Alienation Syndrome’ a False Allegation?
There is no protection, under the PAS theory for children who have actually sufferred physical, sexual or emotional abuse, due to such abuse being virtually impossible to ‘prove’, due to the childs age and general legal disbelief of children’s disclosures…
  We are aware of situations where protective fathers have been denied contact for many convoluted and unjust reasons, and where residential fathers have systematically alienated children from the non residential mother. However,parental alientation SYNDROME has not been an issue in those situations.       http://www.kidsindistress.org.au/parental
http://harfordmedlegal.typepad.com/forensics_talk/child-sexual-abuse-parent.html