A dentist looking for a consult on x-rays needs explicit consent from the patient to transfer the x-rays and related information [securely] to the other doctor, at least in many states.
There are many similar cases where “written” consent is needed to transfer private information, transfer responsibility, request actions, etc. Simply sending information over email or through a web form does not easily include a mechanism for transferring consent — e.g. written authorization signatures.
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