It's incumbent on the community to dispense with the need for evidence-based medicine.
As Goozner wrote, when self proclaimed experts (perhaps key opinion leaders) are convinced they are right, they don't need no stinkin' evidence.
ADDENDUM (2 July, 2008): Dr Wes also weighed in, with considerable skepticism. His post is an excellent primer about how the test is actually done, its drawbacks, and the lack of evidence supporting its use except in special circumstances.