The doctor-patient or therapist-patient privielge only applies to treatment between the patient and the health care practitioner. A murder committed by the patient does not fall within the patient's treatment and is not privileged.In such a situation, such as if the patient is planning to harm a third person but has not done so yet, the health care practioner is legally obligated to advise law enforcement of the possibility of a crime to be committed by his or her patient.Public policy mandates that crimes in this country be prevented where at all possible.