You're always taking some risk when ordering from overseas. The risk being seizure not arrest. It really depends on the actual customs agent the inspects the package. If you're ordering pills for instance it's not like they take every package of pills they discover and run them through the lab to find out what they are. They're not stupid enough to completely rely on what the box says. Sometimes they get seized more often not. The 90 day rule was passed for senior citizens that were taking bus trips to Canada and Mexico to buy cheaper meds ie: carrying them over the border. It does not apply to mail order. In addition if you're having prescription meds mailed to you they are supposed to be clearly marked on the outside of the package that it is medication. If it isn't stamped medication that is cause for confiscation. I have ordered and received meds both ways. The key is don't order more than you can afford to lose.
Don't sweat it, DEA isn't going to kick down your door for a box of Clomid or Lasix. 1,000 hits of E would be another story.
If you really want to check things out go to:
http://www.customs.gov/
They can basically seize anything they want, this is right off the Customs website:
The United States Federal Food, Drug, and Cosmetic Act (21 U.S.C. sections 331(d), and 355(a)), which is administered by FDA, prohibits the interstate shipment (which includes importation) of unapproved new drugs. Unapproved new drugs are any drugs, including foreign-made versions of U.S. approved drugs, that have not received FDA approval to demonstrate they meet the federal requirements for safety and effectiveness. It is the importer's obligation to demonstrate to FDA that any drugs offered for importation have been approved by FDA.
SAF I've gotten stuff left on my doorstep I'd sworn would have been confiscated. Clearly marked "Medication". They must inspect a tiny amount of what crosses the borders.
Genarr3