>This would suppose that the police tell anybody how many matches they get.
Actually if the police fail to disclose evidence to the defence then they are fitting up the subject anyway.
>Why is it that if they have my address, etc that I should give them everything
>else they have? I really can't see it.
It was an observation that they already have lots of info on you that you don't appear bothered about.
>I leave my DNA and fingerprints EVERYWHERE. I leave them on people and
>things that move and leave it somewhere else.
Well, if you're dumping it all over the place then you're not exactly protecting it are you?
>DNA should ONLY be used to reject suspects. AFTER you've got your suspect.
That's just an assertion. Fingerprints have been used in that way for a very long time.
>And what about procedures? One of the reasons why OJ got off was because
>procedures were sloppy. Another story on el reg had someone who had PROOF that
>the DNA evidence was matched because they didn't clean the testing equipment.
More frequent use of DNA will remove the mysticism associated with it and highlight the failings. The sloppy testing when applied to a database of millions would fairly often produce matches of hundreds, maybe thousands. Such statistics could then be used in court to reflect on the validity of the DNA evidence.
>Using DNA to FIND criminals cannot work safely. And finding them is the only
>reason to have a database of them.
Just an assertion again, just because you say it, doesn't make it so.
>Is that enough for you as a reason why I shouldn't allow a DNA database?
No. Don't get me wrong, I'm not keen on the idea, the testing infrastructure for everyone coming into the country would be a right pain and expensive.
@AC
>What I'm afraid about is an expert witness ...
The expert witness is more dangerous now, where DNA is rarely used and there's limited understanding of it and its limitations. Broader use actually devalues its value as evidence.
>a couple of hundred people match a DNA sample from a crime scene, and you are one of them
A cocked up fingerprint match could do the same, in rape cases the police will often ask all the men in the locality for a dna match and refusal makes you suspect there.
Besides, what value will a DNA match that hit 100 people have in court?
What if they do a search for a rapist vetting everyone in your neighbourhood and you match? A single false positive (assuming you're not a rapist ;) ) is a bigger problem for a defence than a hundred.
@ChrisG
>As far as DNA is concerned, it can only be used effectively to exclude people
>from a crime scene
It can't do that at all. DNA can't say who wasn't there.