Which of the following is NOT a service a chiropractor's assistant can perform?

A chiropractor's assistant plays a supportive role in a chiropractic practice and is allowed to perform a variety of tasks that do not require the clinical judgment and licensure of a chiropractor. While they can assist in various patient care activities, performing spinal adjustments is a procedure that involves significant clinical training and is exclusively reserved for licensed chiropractors.

Taking radiographs, assisting with patient exercises, and taking a patient's health history are within the scope of responsibilities for a chiropractor's assistant, as these tasks support the overall treatment process without involving the invasive or therapeutic actions unique to chiropractic practice. Spinal adjustments, however, involve diagnosing and treating complex musculoskeletal issues, which require comprehensive training and the legal authority to practice within the framework established by chiropractic regulations. Thus, this clarifies why performing spinal adjustments is a function not permitted for a chiropractor's assistant.