The CBP webpage on entering the US with prescription medication says:
Prescription medications should be in their original containers with the doctor's prescription printed on the container. It is advised that you travel with no more than personal use quantities, a rule of thumb is no more than a 90 day supply. If your medications or devices are not in their original containers, you must have a copy of your prescription with you or a letter from your doctor. A valid prescription or doctors note is required on all medication entering the United States.
Thus: what's required is that the medicine be prescribed.
Using the original container, with current and correct information on the label, is preferred. In the alternative, a copy of the current prescription or a doctor's letter should be carried. It is suggested that no more than a 90-day supply be carried.
There is no need for stamping (whatever that is) or going to court.