By all accounts, the head nurse at the University of Utah Hospital’s burn unit was professional and restrained when she told a Salt Lake City police detective he wasn’t allowed to draw blood from a badly injured patient.

The detective didn’t have a warrant, first off. And the patient wasn’t conscious, so he couldn’t give consent. Without that, the detective was barred from collecting blood samples — not just by hospital policy, but by basic constitutional law.

Still, Detective Jeff Payne insisted that he be let in to take the blood, saying the nurse would be arrested and charged if she refused.

Nurse Alex Wubbels politely stood her ground. She got her supervisor on the phone so Payne could hear the decision loud and clear. “Sir,” said the supervisor, “you’re making a huge mistake because you’re threatening a nurse.”

Payne snapped. He seized hold of the nurse, shoved her out of the building and cuffed her hands behind her back. A bewildered Wubbels screamed “help me” and “you’re assaulting me” as the detective forced her into an unmarked car and accused her of interfering with an investigation.

The explosive July 26 encounter was captured on officers’ body cameras and is now the subject of an internal investigation by the police department, as the Salt Lake Tribune reported Thursday. The videos were released by the Tribune, the Deseret News and other local media.

On top of that, Wubbels was right. The U.S. Supreme Court has explicitly ruled that blood can only be drawn from drivers for probable cause, with a warrant.