Try opening a chiropractic business with no license and you will get busted for practicing medicine without a license.
I really don't know what kind of training or qualifications chiropractors need or get and in my decades of experience with them there they vary widely. In the early days, it was all just snap and pop stuff but now it seems, at least the ones I've gone to, are very involved with sports medicine and working with athletes with many being athletes themselves. They, again the ones I've gone to, are very knowledgeable in such varied areas of healing including all that acupressure, rolfing, shiatsu stuff I don't have a clue about. I have found them to be very, very helpful. I can't count the number of times when I've gone over a week with a nagging pain and have come out of a chiropractor's office good as new.
Again, I think they vary widely as it doesn't seem as a precise science such as orthopedics or dentistry were there are clearly defined prognosis and procedures. But you get these young doctors that are really passionate and they are always learning and researching on their own so they don't have a wall full of formal certificates but they know their stuff.
