But, he said, "It's more likely to be an inadvertent thing. But it's not the way to handle evidence." The recording also could have come from different sources, he added.
"You can assume that the recording while they're still on the ground came from the tower and then you could assume that the communication with air controllers was while they're in the air," he said.
"They may have just mishandled the cobbling of it together."
This doesn't necessarily prove anything about the investigation, he added.
Having read this "news story" about people listening to audio ... it proves that digging the fly crap out of the pepper is a fine art.