This is actually good to know.
At some point they are going to have to develop some sort of practice standards.
How varied are the schools which train chiropractors and who gives them their certification?
The Anabaptist Jacques
Standardizing chiropractic will never happen. Ever.
The schools vary quite a bit. Some are more spiritual / philosophically based while others are more medical. Some schools teach how to deliver a spinal adjustment, some do not.
Licensure is provided by their state board.