[Dog]

Sounds to me like his source is near the Bin Laden inner circle....IMHO.

[Ex-Dem]

That makes sense and is definitely possible.

When I first saw it, I thought he meant that the source was not impeachable, meaning that it wasn't a government official. Then I went and looked up the definition of "unimpeachable", which apparently means "unquestionable". I could probably spend more time analyzing what Ijaz just said than on analyzing a Bin Laden tape :).