Good question. It was the first one I had when I heard the "official" story, too.

If they have technology out there that can test DNA IN PAKISTAN IN A VERY SMALL TOWN and cross-match it with DNA in the United States, they've got a lot of explaining to do.

Likewise, I'd think that if they were carrying that kind of specific instrumentation on board the ship, they still have some explaining to do.

THIS is one of the many parts of the story that STINKS.