“…The effectiveness of screening has, however, not been convincingly demonstrated. The chiropractic profession tends to downplay the risks: ‘chiropractic services are safe'; 60 ‘the healthy vertebral artery is not at risk from properly performed chiropractic manipulative procedures.’ 61 Others argue that ‘the occurrence of cerebrovascular accidents in the chiropractic population is 0.000008%’, 62 that causality is not proven or even unlikely, 61,63-66 that other interventions are more risky (see below), 67 that the mechanical forces employed for spinal manipulation are too low to cause injury, 68 or that there is a ploy from the medical establishment to sideline chiropractors. 6971 In the light of the evidence summarized above, such attitudes do not seem to be in the best interest of patients.…”