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View Diary: SCOTUS to decide on DNA collection in rape case. (89 comments)

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  •  Yes. (1+ / 0-)
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    enhydra lutris

    Also, it's surprisingly hard to get DNA from something like a blood sample (unless the bleeder has a virus or bacterial infection). A lot of people think that a blood sample from a crime scene is a slam dunk. They might confuse the details in expert testimony.

    Breathe in. Breathe out. Forget this, and attaining enlightenment will be the least of your problems.

    by rb137 on Wed Nov 28, 2012 at 07:24:00 PM PST

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    •  Getting DNA from blood is simple. (0+ / 0-)

      Sometimes crime scene evidence is dirty (contaminated), or the crime scene investigator doesn't collect or identify it properly so sometimes it's origin is unclear, sometimes blood from several sources is mixed and separating mixtures complicates matching . . . dealing with those issues is what DNA analyists do in the lab.  And explaining it to juries is what they do in the courtroom.

      You are making it out to be much more difficult than it actually is . . .

      Fake Left, Drive Right . . . not my idea of a Democrat . . .

      by Deward Hastings on Wed Nov 28, 2012 at 09:06:15 PM PST

      [ Parent ]

      •  My point is that (0+ / 0-)

        a blood sample doesn't contain DNA unless there are white cells in it. If the person's immune system isn't particularly active, it isn't a great source of DNA. Skin is much better, for example.

        Breathe in. Breathe out. Forget this, and attaining enlightenment will be the least of your problems.

        by rb137 on Wed Nov 28, 2012 at 09:13:06 PM PST

        [ Parent ]

        •  That is not entirely correct. (1+ / 0-)
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          rb137

          It is rare for an individual to be so imunosuppressed that their blood is free of white cells . . . as a result even very small blood samples (less than 50 microliters) contain enough DNA to produce a clean profile.  A subject with effectively DNA-free blood is essentially dead (or soon will be, not to make light of a serious medical condition being indicated).  Epithelial cells are easier to collect from a suspect (less intrusive, buccal swabs for example), but often less easy to identify in crime scene evidence than blood stains (for which there are several easy presumptive tests).

          But yes, it is also common to collect a rape victim's fingernails in hope of finding that they have collected skin from the perp . . .

          Fake Left, Drive Right . . . not my idea of a Democrat . . .

          by Deward Hastings on Wed Nov 28, 2012 at 10:07:22 PM PST

          [ Parent ]

          •  If you draw blood that's true. (1+ / 0-)
            Recommended by:
            Deward Hastings

            Scraping it up from a crime scene is another matter. But I don't think we're in any real disagreement here. And thanks for your commentary.

            Breathe in. Breathe out. Forget this, and attaining enlightenment will be the least of your problems.

            by rb137 on Wed Nov 28, 2012 at 10:37:06 PM PST

            [ Parent ]

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