Major Security Breach at Several Airports

Undercover agents from Homeland Security tested TSA agents, who failed to detect explosives and weapons.
1:49 | 06/02/15

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Transcript for Major Security Breach at Several Airports
Now, to that eye-opening, undercover sting. ABC news broke the story today. A major security breach at dozens of American airports. Make believe explosives and weapons sliding right past those tsa agents. 70 tests, they failed 67 of them. You're about to hear more about what they missed. ABC's senior justice correspondent Pierre Thomas again tonight. Reporter: Undercover agents from homeland security put tsa screeners to the test, and they failed miserably. ABC news has learned that tsa screeners were beaten in 95% of those tests designed to see if mock explosives or weapons could be smuggled through airport security checkpoints. The test were conducted by so-called red team investigators, posing as passengers and using techniques that terrorists might employ. According to officials briefed on the results, tsa agents failed 67 out of 70 tests, with red team members repeatedly able to get potential bombs or weapons through security. Any time there's a high rate of misses, that causes concern. Reporter: Sources tell us, in one test, an undercover agent was stopped after setting off an alarm at a magnetometer, but tsa screeners failed to detect the fake explosive device that was taped to his back during the pat-down that followed. The terrorists do watch this thing. They go to school on how they can learn from possible vulnerabilities. I'm jay joe Johnson. Reporter: Homeland security secretarial jeh Johnson was so upset when he got wind of the results he went to tsa headquarters last week to get briefed and now says corrections have been made to deal with the alarming lapses. David, its not clear what security upgrades have been ordered, but some are reportedly already in place. Ever mindful that Al Qaeda and other terrorists groups are obsessed with using aviation against us. David? Pierre Thomas who broke this story on "Gma." Pierre, thank you.

This transcript has been automatically generated and may not be 100% accurate.

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