> the haystack is actually a needlestack (everyone has DNA) But not everyone has matching DNA. Matching DNA makes you a needle. > a needle identification expe

> the haystack is actually a needlestack (everyone has DNA) But not everyone has matching DNA. Matching DNA makes you a needle. > a needle identification expert told you the chance that this is the wrong needle is 200 million to one against This statistic is incorrect, and if the jurors are paying attention you'll be able to tell them why. If it's possible for multiple people in the world to have matching DNA, say 3, and you have matching DNA the chance at this point is 1 in 3, no? Whatever that statistic represents isn't relevant. If the trial was a gameshow and a false conviction cost the jurors $100 (and a false acquittal something commensurate given the standards of proof -- maybe $10 for 90% burden of proof) each I guarantee you the jurors would acquit.