Yes, we're safer--but. It's the answer, with a caveat, to the question that will be on everyone's mind today. But from a technologist's perspective, there are other questions to ask about where we stand five years after the 9/11 attacks. The country has spent billions on technology up- grades to detect and defuse new threats. Have we invested wisely? Are the technologies being deployed effectively? What more can be done? After 9/11, there was an explosion of research and development in sensor technologies, several of which have been deployed. But other technologies are languishing in red tape, according to analysts.