A California Scientist's Eight-Year Journey into the Byways of Dubious 'Stem Cell' Clinics

You could call it the "Knoepfler Effect."

It has bounced noticeably around the country in recent months, leading to headlines in the Washington Post, the Atlanta Constitution, the Los Angeles Times and other outlets in Florida, Seattle and elsewhere.

It involves the activities of dubious, so-called "stem cell clinics" -- enterprises once ignored by the ma…