Security Lapse at New Jersey Airport Raises Safety Questions

Undercover agent carries explosive device through Newark Liberty security gate.
1:41 | 03/08/13

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Transcript for Security Lapse at New Jersey Airport Raises Safety Questions
Learned about a flaw in security designed to protect against terrorism tonight -- undercover agent of the US government. Easily got a fake explosive device through airport security undetected. How did they do that while ABC's David -- tells us. A stunning breach of security an undercover investigator with the fake bomb hidden on his body last week in -- isn't caught I find it somewhat. Shocking not surprising the TSA tells ABC news that agent with the device hidden so well it would be difficult to detect. Went through a metal detector but he was pulled aside for a -- down to the officers at the checkpoint never found the fake. Bomb -- sort of like red teaming scenario you intentionally. Look for where the weak points are in that system. I think it clearly identify the vulnerability. The TSA says those red team test happen at a checkpoint like this weekly somewhere in the country but the agency refuses to say how often its officers failed to find the device. The focus on devices in liquid explosives is a big reason why the TSA says it will stop looking for pocket not allowing them on the aircraft. That plan is facing a growing backlash flight attendants using the White House petition site already have 101000 signatures demanding the policy remain no knives on board. And air marshals and some pilots are now joined that effort. Saying they will ask congress to intervene and stop the planned TSE change we are going to spend every single day between now and then ensure that it doesn't. -- may be debated but there is no debate that explosive devices should ever get through. One of these checkpoints. David -- ABC news Washington.

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

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