When chiropractors use spinal manipulation therapy for symptomatic relief of mechanical low back pain, they are employing an evidence-based method also used by physical therapists, doctors of osteopathy, and others. When they do “chiropractic adjustments” to correct a “subluxation” for other conditions, especially for non-musculoskeletal conditions or “health maintenance,” they are employing a non-scientific belief system that is no longer viable.

On the quackery of chiropractic spinal manipulations. I like this bit though: "The courtroom is no place to settle scientific disputes, and silencing journalists, scientists or sceptics with legal threats is, in my view, cowardly."