Oregon Chiropractic Physician's Statement of Certification is an official document that certifies that a chiropractor has met the education and training requirements to practice chiropractic medicine in the state of Oregon. This document is sometimes referred to as a "Certificate of Qualification" or "License to Practice". The Statement of Certification is issued by the Oregon Board of Chiropractic Examiners (ONCE), and must be renewed every two years. There are two types of Oregon Chiropractic Physician's Statement of Certification: the Limited Statement of Certification, which allows the chiropractor to practice basic chiropractic techniques; and the Full Statement of Certification, which allows the chiropractor to practice more advanced techniques, including the use of certain devices and techniques. Both Statements of Certification require completion of continuing education credits every two years in order to maintain certification.