Choose your options below This program is not active. Class 4 Laser Therapy Science and Physiology Product Type: On Demand Multiple formats available, please choose a product format below DC Version: Class 4 Laser Therapy Science & Physiology - On Demand $35.00 - Regular Member TCA or CAT Member $35.00 - Chiropractic Assistants of Tennessee TCA or CAT Member $50.00 - NON Member