So if these needle injected poisons change your genetic code,does that mean hypothetically you could have commited a crime pre injection and they could not trace it back to you using dna data?
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No. They don't compare the full genome, only parts of it based on whatever DNA is recovered.
It's kind of like asking if your fingerprints change because you got genes that changed your hair color. They don't. Not only that, but mRNA would only be adding extra, not swapping out some old DNA for new. So anything looking to match pre-existing DNA could still find the match.
I don't work in a crime lab or anything, but did have college biology courses and lots of crime TV "experience." For what it's worth, that's my take.
Thank you. Your last line sounds like a Holliday Inn express Commercial
Ooooooooh... interesting thought.