Henry Billings Brown,
Cook v. Marshall — Opinion of the Court
“ But the same policy which authorizes the use of this power as a shield to protect commerce from the vexatious interference of the states forbids its employment as a sword to assail measures designed for the preservation of the public health, morals, and comfort. States may differ among themselves as to the necessity and scope of such measures, but so long as they are adopted in good faith, with an eye single to the public welfare, they are as much entitled to the recognition of the general government as if they were uniformly adopted by all the states. ”
