It is not legal to sell marijuana in Canada (unless for medical purposes, and then it is regulated). Since when do the British and the Swiss not abide by international copyright infringement laws?
These claims are mostly urban legend and have no basis in fact.
whoa. read again? maybe "these" claims have no basis in fact because you distorted them pretty bad.
these are apparently marijuana seeds, not plant material, you'd be stupid to try mailing pot. seeds are usually handled differently (legally); because of the large scale of the marijuana industry i'm sure it's still a bad idea in most countries to openly buy and sell marijuana seeds, but for things like baby wood rose seeds, poppy seeds and mushroom spores it's all about intent and/or what you do with them.
the DMCA is just a convenient tool for oppression, like the threat of a SLAPP suit. doesn't have a whole lot to do with copyright infringement and certainly isn't international. aside from that, even Dmitry Sklyarov wasn't arrested under the DMCA until he set foot on USA soil of his own accord.
edit: and more on point, this is pretty outrageous. you'd be pretty pissed off if someone you knew were extradited to France for selling WW2 memorabilia, or to Canada for drawing cartoon porn, no?