Bill Williams
Penultimate Amazing
- Joined
- Nov 10, 2011
- Messages
- 15,713
I think "presumptive blood test" is a fine appellation. It accurately describes how luminol is used at crime scenes, when it is used properly, i.e. to develop meaningful evidence.
Here is a case where it was used properly:
http://www.cbsnews.com/news/two-wiv...cious-accidents-was-it-coincidence-or-murder/
Investigators got a luminol result that they presumed was blood because its location and appearance fit with a scenario in which their suspect bludgeoned his wife, loaded her into a car, and then staged an accident to make it look like that was what killed her.
Having found these latent stains, they took their swabs back to the lab. Sure enough - the substance was confirmed to be blood, and in fact it was confirmed to be the victim's blood.
Contrast with the Meredith Kercher investigation, where the presumptive test did not check out in the lab, and the traces themselves do not fit with any plausible theory of the crime - to the point where "Machiavelli" is explaining them by saying Amanda/Raffaele slid around the crime scene on bathmats after committing the murder.
I kid you not. I have been pestering him to elaborate, but he knows better than to take that challenge.
The problem is not that the nomenclature is wrong. The problem is that the guilt faction interprets "presumptive" to mean "definitive" or "conclusive." I don't know what can be done about that.
With all due respect, C.W., they are making the mistake of believing that because it's a more sensitive test somehow means it is no longer a presumptive test.
This is the basis of their argument that luminol is more sensitive than the confirmatory tests. Somehow it changes the nature of the test as presumptive into something else - into something that positively I.D.'s the substance.......
....... they think that making it a better presumptive test somehow transforms it into a confirmatory one.
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