None whatsoever. Besides if you live in the United States U.S. Customs will not pursue you unless you are buying large quanities of cannabis seeds. Instead they will remove the contraband from the package and send you the empty letter and in addition mail you a document telling you that illegal contraband was found in your parcel. You don't have to worry about them marking you or busting your door down. Besides customs rarely ever intercepts seeds as they are highly undetectable due to their small size. As for the company I referred you too they don't send a package saying cannabis seeds on it instead they use something called stealth packaging which is usally an empty CD case with your breeder packs of seeds in it. Trust me you have nothing to worry about. I have mail ordered seeds on many occasions and never once had customs intercept my package. Good luck bro.