He could have breezed through security at any airport.

A terrorist wearing the latest underwear bomb would not have been caught by the TSA’s most conscientious human screeners or its highest-tech fullbody scanners, experts told The Post yesterday. But the country ducked a disaster by employing an age-old weapon: a double agent.

With the help of American allies in Saudi Arabia and Yemen, the secret agent inserted himself into the terrorists’ secret inner circle, and became so trusted, the thugs accepted his offer to board a US-bound plane wearing the bomb.

Instead, the agent turned it over to the United States.

But experts said that as far as future suicide bomb attempts are concerned, current technology is not good enough to find nonmetallic explosive devices like the newest underwear bomb — despite Homeland Security Secretary Janet Napolitano’s assurance that there was a “high likelihood’’ the bomber would have been stopped.

One top law-enforcement official insisted, “They would not have gotten him.’’

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