Das schreiben zitiert US Vorschriften:
§1301.26 Exemptions from import or export requirements for personal medical use.
Any individual who has in his/her possession a controlled substance listed in schedules II, III, IV, or V, which he/she has lawfully obtained for his/her personal medical use, or for administration to an animal accompanying him/her, may enter or depart the United States with such substance notwithstanding sections 1002-1005 of the Act (21 U.S.C. 952-955), provided the following conditions are met:
(a) The controlled substance is in the original container in which it was dispensed to the individual; and
(b) The individual makes a declaration to an appropriate official of the Bureau of Customs and Border Protection stating:
...
http://www.ecfr.gov/cgi-bin/text-idx?SID=f32202461c359646a7d9cccad98b580c&mc=true&node=se21.9.1301_126&rgn=div8Also ist die Deklarationspflicht sehr wohl "offiziell".
Und ob nicht US Ministerien nun alle US Vorschriften kenne wage ich auch zu bezweifeln...