You'll often find that this document is not generated automatically by the testing equipment, but rather it is produced by some unknown individual who purportedly noted the test result indicated by the equipment. But this isn't the end of the prosecution's problems with this type of evidence. The opinion held that medical blood alcohol analysis methods are not generally accepted for forensic purposes. That flaw in medical blood alcohol methods occurs because these methods don't need to produce very accurate results. Doctors don't need to analyze blood as accurately as is needed for courtroom use.
Doctors are more concerned with a general indication of the blood alcohol concentration.
They just want to know the patient's general condition. Exact results to two or three digits aren't needed, and the analysis methods they use are not designed to be that accurate. The patient consent, usually given when the emergency room admission papers are signed, is for medical treatment only. In these situations, a threat to the hospital of a suit for battery could be effective. Federal law may be more helpful.