[MadIvan]

Has to be the FSB - private individuals would have an impossible time getting the radioactive material and the means to deliver it.

Regards, Ivan

[JadeEmperor]

"Has to be the FSB - private individuals would have an impossible time getting the radioactive material and the means to deliver it."

Actually, decades ago there were record duster brushes containin small amounts of Polonium being sold retail: http://www.blackcatsystems.com/science/radprod.html But I guess to poison him like that it had to be a pro job.