While I believe this methodology to be true. Pistole made comments last Nov saying that the bomb was actually external:

http://www.aolnews.com/2010/11/22/ts...avity-searches

But Pistole said that current intelligence does not support the threat of bombs being placed in body cavities, and he disputed reports that an al-Qaida-linked terrorist last year used a bomb placed inside his rectum in an unsuccessful attempt to kill Saudi Prince Mohammed Bin Nayef. Pistole, a longtime veteran of the FBI, said reports that Abdullah Asieri had secreted the bomb inside a body cavity were "inaccurate" and not supported by the forensics he had seen.

"There is a stronger indication in findings that it was actually a Abdulmutallab-type underwear [bomb] ... strapped to the upper thigh, as opposed to being [in] a body cavity," Pistole said.

Even if terrorists did resort to cavity-type bombs, Pistole said that current screening procedures would be able to pick them up because it would require a device outside the body to initiate the explosion. "That's what the [Advanced Imaging Technology] machines pick up," he said.

Pistole acknowledged the concern, however, that many of the devices that could be used to initiate an explosion, such as a cell phone, might not immediately draw suspicion, even if spotted by screeners.

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However, to date only Pistole has made such a comment. As such, I do not give much credence to it. Especially, as it was made in the midst of the op out before Thanksgiving.