Oregon Revised Statutes Procedure in Criminal Matters Generally § 133.621

A duly licensed physician, or a person acting under the direction or control of a duly licensed physician, may withdraw bodily substances, pierce human tissue, perform medical tests and procedures and otherwise use medical procedures to gather evidence in a criminal investigation. A duly licensed physician, or a person acting under the direction or control of a duly licensed physician, shall not be held civilly liable for gathering potential evidence in a criminal investigation in a medically acceptable manner at the request of a peace officer. The civil immunity granted in this section is not conditioned upon the existence of probable cause, the existence of a search warrant or the existence of a court order. Nothing in this section shall be interpreted as requiring a duly licensed physician to act at the request of a peace officer.