Identification of unusual items more difficult as commonly found objects likely crowd them out

A smartphone app that turns gamers into airport baggage screeners is showing that finding weapons and other illegal items isn't all that easy, even when you're looking for them.Duke University researchers analyzed data from searches of 20 million virtual suitcases in the game Airport Scanner created by Kedlin Co. and found that users failed in most cases to identify objects that occurred only rarely."We're seeing that people are really bad at finding items that are not likely to appear," said Stephen Mitroff, Ph.D.