INVN: I don't see any near-term fundamental reason for the falloff, although I can't pretend to understand the Homeland Security Act in any nuanced way. Maybe there's something in there that's being interpreted as a negative for INVN.
I'm inclined to think the criminals are walking it down ahead of a war with Iraq, which probably should bring some mojo back to the stock. It's also possible that INVN is just being regarded as old news in the war on terror, which of course would make a long play on the stock much more dangerous.