"Personal privacy is an exalted right but, as in marital privacy, it has never been regarded as absolute. A person may be subjected to a “stop and frisk” though it constitutes an intrusion upon his person, or a person may be required to submit to a vaccination, and a blood sample may forcibly be extracted from the body of an individual arrested for suspicion of driving while intoxicated. A woman has been required to submit to a blood transfusion necessary to preserve her life in order that her small child shall not be left without a mother. The “right of privacy” is a highly cherished right—however one which is nowhere expressly mentioned in the Constitution of the United States or its amendments."