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> But aren't prosecutors and lawyers really a part of the general public when it comes to forensics? In this case, no, they aren't. A better comparison would b
by __jal 10y ago
> But aren't prosecutors and lawyers really a part of the general public when it comes to forensics?
In this case, no, they aren't. A better comparison would be to a general contractor hiring an electrician. A prosecutor is likely to have no more formal education or hands-on experience with forensic science. But, as professional "consumers" of expert testimony, and a motivation (professional duty) to win, you can't evaluate their scientific ignorance the same way you'd evaluate a juror's. I don't think the reason bite mark analysis lasted so long is because Judge Goodsense watched cop shows, any more than you can say a GC can't be blamed for shoddy wiring because they weren't a member of the Electrician's Local.
To swap contexts, nontechnical people who work with programmers may not be able to give you the big-O cost of a loop, but they tend to know when a programmer is bullshitting about something.
This goes to my contention that the CSI effect isn't just 'I believe it 'cause I saw it on the toob'. Education, lived experience, class, personality and other priors play in to it. In the case of criminal evidence admissibility, I think there is at least motivated reasoning as there is true belief in methods. The motivation is in part the same as with how plea deals have evolved - the current criminal justice system would collapse if trials were needed for more than a tiny fraction of cases. Magic evidence is a performance hack.
I don't disagree that ambient falsehoods matter. I am saying that comparing motivated professionals in a field with random MOPs misses a lot of the picture, and that even your MOP is going to react to ambient falsehoods they can't evaluate differently, based on priors.
- int_19h 10y ago> This goes to my contention that the CSI effect isn't just 'I believe it 'cause I saw it on the toob'. I don't think that is the case in general, either. The problem is that "I saw it on the toob" has secondary effects, that attenuate as they propagate, but can still go a long way. Basically, you might not believe that DNA testing is 100% correct because you saw it on TV; but you you believe it to be 100% correct because "everybody knows it", and the reason why they do is because "everybody knows it", and so on, until you actually get to a much smaller minority who believe it because they personally saw it on TV. (In general, it's amazing how many popular "common sense" things are blatantly false, but they keep getting repeated and propagated as part of ambient noise of society, because "everybody knows it".)