In fact, the majority of mental health and legal experts who have studied the issue consider PAS theory to be both erroneous and dangerous to the children involved.

excerpt:

What is Parental Alienation Syndrome (PAS)?

Although some mental health professionals and child custody evaluators, attorneys, and judges have been quick to accept and admit PAS as evidence in these disputes, there has been no consistent empirical or clinical evidence that PAS is a valid syndrome or that the so called "alienator's" behavior is the actual cause of the alienated child's behavior towards the target parent (Walker et al, 2005). In fact, the majority of mental health and legal experts who have studied the issue consider PAS theory to be both erroneous and dangerous to the children involved.

In fact, the majority of mental health and legal experts who have studied the issue consider PAS theory to be both erroneous and dangerous to the children involved.
http://www.leadershipcouncil.org/1/pas/faq.htm