Because they desire "insurance" such as medicaid, welfare, and private companies, the bad ones have x ray machines right in their offices.....
A good one most likely will have been practice for 20+ years, have no x-ray machines and never attempt to remove your shirt for any reason. The creeps will scam you for everything they can, which has made 95% of the chiropractors in my opinion, more than worthless.
It is getting very popular for female chiropractors and I would never suggest wasting your time on one, if they are not strong enough to handle 200+ people all day long, then they have no business in the chiropractor business.