Unfortunately, "effective" is also known as "racial profiling".

Another case where political correctness has subverted simple logic.

Even children don't go fishing in areas where there are no fish because it's a
waste of time and money.

However, to be "PC," it is national policy that we waste huge amounts of time
and money searching people who have a negligible chance of being hijackers.
Which, of course, reduces the time and money available to actually work on
catching potential highjackers. Net result: Less safety, higher cost.