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Sanitary laws were the first public health measures. An early record of these laws is in Leviticus 11-16. The Romans developed the discipline of sanitary engineering--building water works and sewers. The next advance in public health was the quarantine of disease-carrying ships and their passengers, instituted in response to the diseases brought back by the Crusaders. The word quarantine derives from quadraginta, meaning "forty." It was first used between 1377 and 1403 when Venice and the other chief maritime cities of the Mediterranean adopted and enforced a forty-day detention for all vessels entering their ports.[108]

The English statutory and common law recognized the right of the state to quarantine and limit the movement of plague carriers. Blackstone observed that disobeying quarantine orders merited severe punishments, including death. The American colonies adopted the English laws on the control of diseases. When the Constitution was written, public health power was left to the states, because it was considered fundamental to the state's police power:

It is a well-recognized principle that it is one of the first duties of a state to take all necessary steps for the promotion and protection of the health and comfort of its inhabitants. The preservation of the public health is universally conceded to be one of the duties devolving upon the state as a sovereignty, and whatever reasonably tends to preserve the public health is a subject upon which the legislature, within its police power, may take action.[109]

Soon after the Constitution was ratified, the states were forced to exercise their police power to combat an epidemic of yellow fever that raged in New York and Philadelphia. The flavor of that period was later captured in an argument before the Supreme Court:

For ten years prior, the yellow-fever had raged almost annually in the city, and annual laws were passed to resist it. The wit of man was exhausted, but in vain. Never did the pestilence rage more violently than in the summer of 1798. The State was in despair. The rising hopes of the metropolis began to fade. The opinion was gaining ground, that the cause of this annual disease was indigenous, and that all precautions against its importation were useless. But the leading spirits of that day were unwilling to give up the city without a final desperate effort. The havoc in the summer of 1798 is represented as terrific. The whole country was roused. A cordon sanitaire was thrown around the city. Governor Mifflin of Pennsylvania proclaimed a non-intercourse between New York and Philadelphia.[110]

The extreme nature of the actions, including isolating the federal government (sitting in Philadelphia at the time), was considered an appropriate response to the threat of yellow fever. The terrifying nature of these early epidemics predisposed the courts to grant public health authorities a free hand in their attempts to prevent the spread of disease:

Every state has acknowledged power to pass, and enforce quarantine, health, and inspection laws, to prevent the introduction of disease, pestilence, or unwholesome provisions; such laws interfere with no powers of Congress or treaty stipulations; they relate to internal police, and are subjects of domestic regulation within each state, over which no authority can be exercised by any power under the Constitution, save by requiring the consent of Congress to the imposition of duties on exports and imports, and their payment into the treasury of the United States.[111]

Few cases have challenged the constitutionality of state actions taken to protect citizens from a communicable disease. The only successful attacks on such exercises of state police power have been based on federal preemption of state laws that restricted interstate commerce. Yet even interference with interstate commerce is not always fatal to health regulations. If a state regulation is substantially related to health and safety, the Supreme Court will uphold it. This is true even if the regulation interferes with interstate commerce, such as would result from a cordon sanitaria in which all travel is forbidden. From vaccinations to quarantines, laws enacted to protect society have been upheld even when they force individuals to sacrifice liberty and privacy.

[108]Bolduan C; Bolduan N: Public Health and Hygiene. 1941.

[109]In re Halko. 246 Cal 2d 553, 556, 54 Cal Rptr 661, 663 (1966).

[110]Smith v. Turner. 48 US (7 How) 283, 340-41 (1849).

[111]Holmes v. Jennison. 39 US (14 Pet) 540, 616 (1840).

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