[jec41]

Offering facts not in evidence. You have no way of determining that this is the case; it is merely an idea. There is no way to test or falsify the statement you made.It has already been tested by DNA. No two possess the same DNA except identical twins, identical triplets, etc. They are of the same reproduction and egg and even they differ upon examination in such physical things as height, weight, finger length, mouth width and ears. The differences may be slight but they exist. DNA is used to test for idenity because no two are the same of different reproduction.

[webstersII]

"and is proved by the observation that no two of the 6.7 billion people that exist on earth are a exact duplicate"

Did you test each one?