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

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  •  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-)
      Recommended by:
      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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