NSJ
Different incident - there were 80 pax on the UA319. The IAD plane was ex-LHR. And a US Air flight has landed at Indianapolis after an FA found 'some powder' in the trash. Hard to keep track of powdermania.
According to CNN, the SJC scare turned out to be paper confetti ! which fell from the guy's bag. Right up there with the Sweet-n-Lo attack.