Security

TSA screeners slower than amateurs, but more accurate, study says

June 24, 2013 at 9:25 AM ET

TSA scanners
Ben Popken / NBC News
TSA employees at Chicago Midland process baggage in this photograph taken on September 18, 2011.

If airport security line sometimes feel like they take forever, travelers fuming over the delays should know that screeners taking their time may actually be most effective at the security gate, according to a new study.

In an experiment pitting TSA agents against Duke University students, the professionals were slower than the civilians in a test measuring visual searching ability, but the civilians were less precise.

“What we found was that the TSA officers were more accurate in finding the target than the members of the Duke community. They also took more time, so it’s more of a methodical search, which led to better performance,” said Duke University psychologist Stephen Mitroff, who is leading the research, which is part of a broader Department of Homeland Security-funded initiative.

test photo
Courtesy Duke University
This is an example of an image presented to the TSA agents and students. The participants had to look for the perfect letter T among shapes that looked similar but were "distractors."

Some 206 TSA agents took the test in a quiet room at Raleigh-Durham International Airport. Each officer was shown a series of images that contained eight to 32 shapes and told to find one that looked like a perfect letter T.

To make things trickier, half of the screens shown didn’t contain the right shape at all.

Then, the exact same test was given to 93 Duke undergraduates.

Mitroff called it “a very simple search task,” but it was designed to put everyone on equal footing, testing their raw search abilities. Real baggage scan images would have confused the amateurs and TSA screeners would have had an advantage.

The students were 82 percent accurate at finding the target shapes and took 3.86 seconds per scan, on average. The TSA officers took more than 6 seconds, but had accuracy rates of 87 to 88 percent.

Consistency was key factor for the most experienced screeners. TSA agents who took about the same amount of time each time they looked a scan were the most precise. Mitroff said this is likely because they’ve developed a visual scanning system that works whether they're looking for the perfect letter T on a computer screen, or a gun on an airport scanner.

“Our interpretation is those who are most experienced have found their strategy and use it the same way over and over – whether you spiral through the bag or are zig-zagging left and right. If you’re always doing the strategy and always doing it consistently, you’re freeing up your cognitive resources -- your other abilities to try to identify targets,” Mitroff said.

He and his team have presented the results at TSA headquarters, noting the agency was “very interested in the project.”

The TSA and the Department of Homeland Security did not respond to requests for comment for this story. The study is published online in the journal, “Visual Cognition.”

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