Conboy v. Mogeloff
Facts
Ruth Dillenbeck consulted defendant physician for persistent headaches and occasional unconsciousness, and defendant diagnosed migraine, prescribed Fiorinal, and advised her that she could drive a car. Several days later, after taking Fiorinal for a headache, Dillenbeck lost consciousness while driving with her children as passengers and crashed into a bridge abutment, injuring them. Plaintiff alleged defendant was negligent in advising Dillenbeck that she could drive despite knowing Fiorinal had a sedative effect. The children sued defendant even though they were not defendant's patients.
Issue
Did the physician owe a legal duty to the patient’s children, as third parties, either because he had sufficient ability and authority to control the patient’s conduct or because the children allegedly relied on his advice to their mother?
Rule
As a general rule, a defendant has no legal duty to control the conduct of third persons so as to prevent them from harming others. Such a duty arises only when the defendant has sufficient ability and authority to control the third person's conduct. In the physician-third-party context, any possible duty based on reliance requires actual privity or something approaching privity, including conduct linking defendant to plaintiff and evincing defendant's understanding of plaintiff's reliance.
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If Mara sues Dr. Patel for negligence, what is the strongest argument for dismissing the claim?