Napolitano: Shoes may not need to be removed for future airport screenings

But in a speech in Washington Tuesday, Napolitano said the TSA eventually might not require shoe removal.

“You’re going to see better technology over time," she said. “In terms of what we see coming in the months and years ahead, it will probably be easier, and it looks like it will be, to deal with the shoe issue before we can lift restrictions on liquids."

Currently, the TSA limits liquids to containers that are less than 3.4 ounces. The containers must be able to fit in a quart-size bag, and passengers are limited to one bag each.

Even as technology is improving, Napolitano said the threat to airplanes is still high.

“Terrorists abroad continue to focus on aviation,” she said. “Why? Because aviation [attacks] succeeded in the past.”

Napolitano made the remarks about the possibility of removing shoes at airport security during at a breakfast briefing hosted by Politico.

In a statement released by her office last week, she said that with the 10th anniversary of the Sept. 11, 2001, terrorist attacks approaching, the Homeland Security department was in a "heightened state of vigilance" about the possibility of an attack.

However, there was "no specific or credible intelligence that al Qaeda or its affiliates are plotting attacks in the United States to coincide with the 10-year anniversary of 9/11," Napolitano said.