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GAO said research shows there could be value to studying behavior in connection with an interview, but that is not part of TSA’s program.

Homeland Security Committee Chairman Michael T. McCaul, Texas Republican, said he still sees some value in behavior detection but that the GAO report’s conclusions “are concerning.”

“The terrorist threats to our aviation system require us to constantly re-evaluate and evolve our security procedures, and if this program isn’t working, we need to find something that will,” he said.

Some passengers have complained that the program amounts to racial or ethnic profiling, and TSA has tried to take steps to crack down on that. But of the 25 officers interviewed by investigators for the report, 20 percent said racial profiling was happening at their airports.

GAO investigators said the TSA doesn’t collect enough data to determine whether profiling was occurring.