Excerpt " Gardner 's proposed remedy for extreme cases is unsupported and endangers children."

Bruch, Carol S. Parental (2001). Alienation Syndrome and Parental Alienation: Getting It Wrong in Child Custody Cases. Family Law Quarterly, 35, 527.

According to Bruch, the deficiencies in PAS theory are multiple. In addition to its lack of scientific support, Bruch notes the following problems: 

First, Gardner confounds a child's developmentally related reaction to divorce and high parental conflict (including violence) with psychosis. In doing so, he fails to recognize parents' and children's angry, often inappropriate, and totally predictable behavior following separation.
Second, possibly as a consequence of these errors and his tail-of-the-elephant view, Gardner vastly overstates the frequency of cases in which children and custodial parents manufacture false allegations or collude to destroy the parent-child relationship.
Third, in this fashion, PAS shifts attention away from the perhaps dangerous behavior of the parent seeking custody to that of the custodial parent. This person, who may be attempting to protect the child, is instead presumed to be lying and poisoning the child. Indeed, for Gardner, the concerned custodial parent's steps to obtain professional assistance in diagnosing, treating, and protecting the child constitute evidence of false allegations.
Fourth, Gardner believes that, particularly in serious cases, the relationship of an alienated child with the rejected parent will be irreparably damaged, probably ending for all time,
Fifth, as these sources suggest, Gardner 's proposed remedy for extreme cases is unsupported and endangers children.

http://www.leadershipcouncil.org/1/pas/2.html