The famous case of the cops arresting the nurse for not performing a blood draw without a warrant after a car accident is much the same:

The other driver in the car accident was a drunk off-duty cop who blew a red light and hit the patient (who later died).

Cops simultaneously scrambled to the hospital to get a blood draw there, while also delaying the draw on their buddy for hours.

Cop who performed the arrest was fired. And later sued the department for unfair dismissal, IIRC.