Guess again.
The police power of a State embraces such reasonable regulations relating to matters completely within its territory, and not affecting the people of other States, established directly by legislative enactment, as will protect the public health and safety.
While a local regulation, even if based on the acknowledged police power of a State, must always yield in case of conflict with the exercise by the General Government of any power it possesses under the Constitution, the mode or manner of exercising its police power is wholly within the discretion of the State so long as the Constitution of the United States is not contravened, or any right granted or secured thereby is not infringed, or not exercised in such an arbitrary and oppressive manner as to justify the interference of the courts to prevent wrong and oppression.
The liberty secured by the Constitution of the United States does not import an absolute right in each person to be at all times, and in all circumstances, wholly freed from restraint, nor is it an element in such liberty that one person, or a minority of persons residing in any community and enjoying the benefits of its local government, should have power to dominate the majority when supported in their action by the authority of the State.
It is within the police power of a State to enact a compulsory vaccination law, and it is for the legislature, and not for the courts, to determine
Page 197 U. S. 12
in the first instance whether vaccination is or is not the best mode for the prevention of smallpox and the protection of the public health.
Jacobson v. Massachusetts: A state may enact a compulsory vaccination law, since the legislature has the discretion to decide whether vaccination is the best way to prevent smallpox and protect public health. The legislature may exempt children from the law without violating the equal protection...
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