A 2009 study published in the Proceedings of the National Academy of Sciences asserted that , due to terrorists being vastly outnumbered by innocents , racial profiling is no more effective than random profiling . It has also been claimed that any form of profiling is less secure than random profiling , because a terrorist cell can simply have a number of members go through airport security , until one is reliably not profiled , then use that individual to perform an attack . None of the 19 successful hijackers in the September 11 attacks were reported or even remembered by checkpoint supervisors
September 11 attacks
September 11 attacks
Airport racial profiling in the United States