Closer to Truth on PBS

The efficacy of alternative medicine is explored. Guests include psychiatrist Hyla Cass, the author of “All About Herbs”; public-health professor Robert Jarvis, the author of “Readers Guide to 'Alternative' Health Methods”; physician Daniel Labriola, the author of “Complementary Cancer Therapies”; and retired medical professor Wallace Sampson, editor of “The Scientific Review of Alternative Medicine.”