It will be observed that the cases Ex parte Jackson and In re Rapier go no further than to sustain the power of the United States to exclude from the mails matter which it deems objectionable. They do not decide that Congress may permit the sending into a State and the delivery therein of matter considered seditious, immoral, or otherwise objectionable by that State. This point has never been passed upon by the Supreme Court, It has, however, been debated in Congress and there is an opinion of the United States Attorney-General Cushing32 that Congress has not this power. This opinion declares that while the Federal Government has full control, free from state interference, to regulate the transmission of the mails up to the time of their receipt by the postmaster of the office to which they are directed, the States may, in the exercise of their acknowledged police power, prevent their citizens from receiving incendiary or other matter which they deem objectionable.33