There is some precedence. A University of Penn student purchased cyanide from Amazon and committed suicide. It's a very sad story. Her parents sued and Amazon settled. The difference here being SN is widely used for various purposes, including cooking/food preservation.
www.campussafetymagazine.com
UPenn, Amazon Settle Lawsuit Relating to Student's Suicide
The lawsuit accused the university and the online retailer of negligence.
www.campussafetymagazine.com
