[Gator101]

The only evidence containing DNA was from a swab from the victim, Moore said, and a single test would consume the entire sample. An inconclusive test would exhaust all evidence.

I am guessing from this statement that a DNA sample can only be compared against another sample and be judged a match or a mismatch? Do we not have the ability to "record" the DNA, sort of like a photo-copy, so it would be available for as many tests as needed? Any scientific Freepers know more, or know if we might eventually be able to do this someday?

[erikm88]

Yes. It is called Polymerase Chain Reaction (PCR). It is used to copy DNA. It has been used in prior cases to exonerate or convict a defendant. In some cases where DNA has been limited, PCR was used to test against other questioned samples admitted into evidence.

[Dan(9698)]

I am guessing from this statement that a DNA sample can only be compared against another sample and be judged a match or a mismatch?

That used to be true, but the technology has advanced to where they can make a numerical representation to be put in a data base.

It is accurate enough to be sicentifically repeatable and valid.