A National Public Radio program by Alix Spiegel, All Things Considered, November 21, 2007 is online. From the NPR site:
Psychologists and other mental health professionals are increasingly playing a role in child custody disputes.
Using a battery of psychological tests and expert judgment, psychologists make recommendations about which parent should have custody.
Those decisions are accepted by judges more than 90 percent of the time, but critics say the tests are flawed and the decisions are often more personal than professional.