The answer is no. It's been debated a trillion times on here, but the fact of the matter, if you read the actual law regarding importation (which is on this site, btw), you must have a federal license to import drugs into the country in any manner other than if you personally carry them across the border, and that cannot be over a certain amount. Don't take my word for it, here is a quote from here
" Only those people who are registered with DEA as importers and who are in compliance with DEA requirements may have controlled substances shipped into the customs territory or jurisdiction of the U.S. from a foreign country."

And from much further down the same website, the facts:

Is it Legal to Buy Controlled Substances From Foreign Internet Sites and Have Them Shipped to the U.S.?

No, having controlled substances shipped to the U.S. is illegal unless you are registered with DEA as an importer and you are in compliance with 21 U.S.C. 952, 953, and 954 and 21 CFR part 1312. Some foreign Internet sites claim they can legally sell these controlled substances; other sites, knowing that such shipments are illegal, advise consumers of ways to avoid having the packages seized by U.S. Customs. The Controlled Substances Act prohibits any person from importing into the customs territory of the U.S. any controlled
substance or List I chemical (21 U.S.C. 971 and 21 CFR part 1313) unless that person maintains a valid, current authorization to import such substances or chemicals (21 U.S.C. 957(a)). DEA regulations further state:

"No person shall import or cause to be imported any controlled substance * * * unless and until such person is properly registered under the Act (or exempt from registration) and the Administrator has issued him a permit to do so pursuant to Sec. 1312.13. * * *" (21 CFR 1312.11(a))

Illegal importation of controlled substances is a felony that may result in imprisonment and fines (21 U.S.C. 960).

The CSA Provides a Personal Use Exemption for Controlled Substances Purchased Abroad. Does the Exemption Apply to Controlled Substances Bought from a Foreign Internet Site?

The Controlled Substances Act and DEA regulations allow you a personal use exemption to bring a limited quantity of controlled substances into the U.S. for your use only when you bring the controlled substances across the U.S. border in your possession (21 U.S.C. 956, 21 CFR 1301.26). It does not apply to controlled substances being shipped into the U.S. Purchasing controlled substances on the Internet and having them shipped to you in the U.S. is not permitted by the personal use exemption. Such purchases and shipments would be considered "imports" of the controlled substance even if the substance is for your personal use. Unless you are registered as an importer and in compliance with the requirements, such shipments are illegal and subject to seizure.

Does it Make a Difference if I Have a Prescription from a U.S. Doctor for Controlled Substances That I Buy From a Foreign Internet Site?

No, the law remains the same. Unless you are registered with DEA as an importer and are in compliance with DEA's requirements, you may not have controlled substances shipped to you in the U.S. from another country.

It isn't pretty, but that's the law as I see it.. not very ambigious.

L