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Probably "they" refer to prosecution. And yeah, why is prosecution going with that lab/software only? One reason is probably the DNA available for more testing is not enough / one testing could been done reliable with DNA taken from crime scene. Other reason might be behind the scenes incentives, which seems is the defense strategy here

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Even if you had plenty of DNA material, going with multiple labs comes with a risk that one of them comes with a "no match" result - and that is something that is supposed to be disclosed to defense as potential exculpatory evidence - and is a nice source of reasonable doubt for a jury. It's something that is terribly inconvenient for the prosecution when someone has already been charged with the crime...

> why is prosecution going with that lab/software only?

Presumably becquse that lab/software gave them the answer they were looking for.

Why pay for even more lab/software testing when you've already got what you want (especially when it's a possibility that the additional testing will contradict the first)?

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