Thanks for the reminder. I read this and then was distracted by the all the other replies.
Your question is fair and I have an answer.
While it is possible, I do not consider it likely. However, this does not nullify my criticism. Let me explain.
The FBI claims to have obtained 10 "known" DNA samples of the terrorists before any comparison made to the WTC remains. This I have argued, is impossible without a positive identification.
Consider the following 2 quotes, and notice the use of origin and source respectively.
So the FBI passed
I think it is fair to assume that origin and source are being used as synonyms. Yet, hotel rooms and rental cars do not make the list. They are EXTREMELY contaminated. This immediately raises reasonable doubt and thus, does not make the list. In fact, it is a pretty strict list if you really take a look at it (look at my bolding of "and"). These are positive matches.
IMO this demonstrates that "known" DNA samples cannot be identified as such, based on the above two quotes, via a process of elimination.
There are several scenarios, including the one you presented, that could raise reasonable doubt.
This means the 10 samples are void evidence. They don't even have chain of custody papers.
As such, any conclusions made, using the 10 samples is also void. Because they were labeled as "knowns" and we know this is impossible, they become too suspicious, creating reasonable doubt of any conclusions determined in hindsight.
The fact remains that they were already "knowns", before WTC remain analysis. And from the quotes I have provided, having a "known" via process of elimination, is simply impossible.
You have wasted all these pages displaying your characteristic bumptious arrogance and you just don't get the idea that you know nothing about forensic investigations. You keep babbling nonsense, without any clue. If you think that the techniques used by law enforcement agencies are invalid, announce your discovery to the media. At the moment, you are making a fool of yourself.