"These cases are saying, 'If the manufacturer had just included one more warning, I wouldn't have taken the drug, '" says Richard Samp, chief counsel of the conservative Washington Legal Foundation.
The struggling visitors took a seventh-minute lead through Sergio Floccari but goals later in the first half from Stefano Guberti and Giampaolo Pazzini were enough to give Samp the three points.
Giuseppe Biava had a header tipped onto the crossbar by Samp goalkeeper Luca Castellazzi, but he was then sent off just before halftime after receiving a second yellow card for deliberate handball.